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 {0x025d, 0x5682},
56 {0x025d, 0x700},
57 {0x025d, 0x711},
58 {0x025d, 0x1712},
59 {0x025d, 0x1713},
60 {0x025d, 0x1716},
61 {0x025d, 0x1717},
62 {0x025d, 0x712},
63 {0x025d, 0x713},
64 {0x025d, 0x714},
65 {0x025d, 0x715},
66 {0x025d, 0x716},
67 {0x025d, 0x717},
68 {0x025d, 0x722},
69 };
70
is_wake_capable(struct sdw_slave * slave)71 static bool is_wake_capable(struct sdw_slave *slave)
72 {
73 int i;
74
75 for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)
76 if (slave->id.part_id == wake_capable_list[i].part_id &&
77 slave->id.mfg_id == wake_capable_list[i].mfg_id)
78 return true;
79 return false;
80 }
81
generic_bpt_send_async(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_bpt_msg * msg)82 static int generic_bpt_send_async(struct sdw_bus *bus, struct sdw_slave *slave,
83 struct sdw_bpt_msg *msg)
84 {
85 struct sdw_cdns *cdns = bus_to_cdns(bus);
86 struct sdw_intel *sdw = cdns_to_intel(cdns);
87
88 if (sdw->link_res->hw_ops->bpt_send_async)
89 return sdw->link_res->hw_ops->bpt_send_async(sdw, slave, msg);
90 return -EOPNOTSUPP;
91 }
92
generic_bpt_wait(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_bpt_msg * msg)93 static int generic_bpt_wait(struct sdw_bus *bus, struct sdw_slave *slave, struct sdw_bpt_msg *msg)
94 {
95 struct sdw_cdns *cdns = bus_to_cdns(bus);
96 struct sdw_intel *sdw = cdns_to_intel(cdns);
97
98 if (sdw->link_res->hw_ops->bpt_wait)
99 return sdw->link_res->hw_ops->bpt_wait(sdw, slave, msg);
100 return -EOPNOTSUPP;
101 }
102
generic_pre_bank_switch(struct sdw_bus * bus)103 static int generic_pre_bank_switch(struct sdw_bus *bus)
104 {
105 struct sdw_cdns *cdns = bus_to_cdns(bus);
106 struct sdw_intel *sdw = cdns_to_intel(cdns);
107
108 return sdw->link_res->hw_ops->pre_bank_switch(sdw);
109 }
110
generic_post_bank_switch(struct sdw_bus * bus)111 static int generic_post_bank_switch(struct sdw_bus *bus)
112 {
113 struct sdw_cdns *cdns = bus_to_cdns(bus);
114 struct sdw_intel *sdw = cdns_to_intel(cdns);
115
116 return sdw->link_res->hw_ops->post_bank_switch(sdw);
117 }
118
generic_new_peripheral_assigned(struct sdw_bus * bus,struct sdw_slave * slave,int dev_num)119 static void generic_new_peripheral_assigned(struct sdw_bus *bus,
120 struct sdw_slave *slave,
121 int dev_num)
122 {
123 struct sdw_cdns *cdns = bus_to_cdns(bus);
124 struct sdw_intel *sdw = cdns_to_intel(cdns);
125 int dev_num_min;
126 int dev_num_max;
127 bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);
128
129 if (wake_capable) {
130 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;
131 dev_num_max = SDW_MAX_DEVICES;
132 } else {
133 dev_num_min = 1;
134 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;
135 }
136
137 /* paranoia check, this should never happen */
138 if (dev_num < dev_num_min || dev_num > dev_num_max) {
139 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",
140 __func__, dev_num, slave->prop.wake_capable);
141 return;
142 }
143
144 if (sdw->link_res->hw_ops->program_sdi && wake_capable)
145 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);
146 }
147
sdw_master_read_intel_prop(struct sdw_bus * bus)148 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
149 {
150 struct sdw_master_prop *prop = &bus->prop;
151 struct sdw_intel_prop *intel_prop;
152 struct fwnode_handle *link;
153 char name[32];
154 u32 quirk_mask;
155
156 /* Find master handle */
157 snprintf(name, sizeof(name),
158 "mipi-sdw-link-%d-subproperties", bus->link_id);
159
160 link = device_get_named_child_node(bus->dev, name);
161 if (!link) {
162 dev_err(bus->dev, "Master node %s not found\n", name);
163 return -EIO;
164 }
165
166 fwnode_property_read_u32(link,
167 "intel-sdw-ip-clock",
168 &prop->mclk_freq);
169
170 if (mclk_divider)
171 /* use kernel parameter for BIOS or board work-arounds */
172 prop->mclk_freq /= mclk_divider;
173 else
174 /* the values reported by BIOS are the 2x clock, not the bus clock */
175 prop->mclk_freq /= 2;
176
177 fwnode_property_read_u32(link,
178 "intel-quirk-mask",
179 &quirk_mask);
180
181 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
182 prop->hw_disabled = true;
183
184 prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
185 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
186
187 intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);
188 if (!intel_prop) {
189 fwnode_handle_put(link);
190 return -ENOMEM;
191 }
192
193 /* initialize with hardware defaults, in case the properties are not found */
194 intel_prop->clde = 0x0;
195 intel_prop->doaise2 = 0x0;
196 intel_prop->dodse2 = 0x0;
197 intel_prop->clds = 0x0;
198 intel_prop->clss = 0x0;
199 intel_prop->doaise = 0x1;
200 intel_prop->doais = 0x3;
201 intel_prop->dodse = 0x0;
202 intel_prop->dods = 0x1;
203
204 fwnode_property_read_u16(link,
205 "intel-sdw-clde",
206 &intel_prop->clde);
207 fwnode_property_read_u16(link,
208 "intel-sdw-doaise2",
209 &intel_prop->doaise2);
210 fwnode_property_read_u16(link,
211 "intel-sdw-dodse2",
212 &intel_prop->dodse2);
213 fwnode_property_read_u16(link,
214 "intel-sdw-clds",
215 &intel_prop->clds);
216 fwnode_property_read_u16(link,
217 "intel-sdw-clss",
218 &intel_prop->clss);
219 fwnode_property_read_u16(link,
220 "intel-sdw-doaise",
221 &intel_prop->doaise);
222 fwnode_property_read_u16(link,
223 "intel-sdw-doais",
224 &intel_prop->doais);
225 fwnode_property_read_u16(link,
226 "intel-sdw-dodse",
227 &intel_prop->dodse);
228 fwnode_property_read_u16(link,
229 "intel-sdw-dods",
230 &intel_prop->dods);
231 bus->vendor_specific_prop = intel_prop;
232
233 dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n",
234 intel_prop->doaise,
235 intel_prop->doais,
236 intel_prop->dodse,
237 intel_prop->dods);
238
239 fwnode_handle_put(link);
240
241 return 0;
242 }
243
intel_prop_read(struct sdw_bus * bus)244 static int intel_prop_read(struct sdw_bus *bus)
245 {
246 /* Initialize with default handler to read all DisCo properties */
247 sdw_master_read_prop(bus);
248
249 /* read Intel-specific properties */
250 sdw_master_read_intel_prop(bus);
251
252 return 0;
253 }
254
255 static DEFINE_IDA(intel_peripheral_ida);
256
intel_get_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)257 static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
258 {
259 int bit;
260
261 if (slave->prop.wake_capable || is_wake_capable(slave))
262 return ida_alloc_range(&intel_peripheral_ida,
263 SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
264 GFP_KERNEL);
265
266 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
267 if (bit == SDW_MAX_DEVICES)
268 return -ENODEV;
269
270 return bit;
271 }
272
intel_put_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)273 static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
274 {
275 if (slave->prop.wake_capable || is_wake_capable(slave))
276 ida_free(&intel_peripheral_ida, slave->dev_num);
277 }
278
279 static struct sdw_master_ops sdw_intel_ops = {
280 .read_prop = intel_prop_read,
281 .override_adr = sdw_dmi_override_adr,
282 .xfer_msg = cdns_xfer_msg,
283 .xfer_msg_defer = cdns_xfer_msg_defer,
284 .set_bus_conf = cdns_bus_conf,
285 .pre_bank_switch = generic_pre_bank_switch,
286 .post_bank_switch = generic_post_bank_switch,
287 .read_ping_status = cdns_read_ping_status,
288 .get_device_num = intel_get_device_num_ida,
289 .put_device_num = intel_put_device_num_ida,
290 .new_peripheral_assigned = generic_new_peripheral_assigned,
291
292 .bpt_send_async = generic_bpt_send_async,
293 .bpt_wait = generic_bpt_wait,
294 };
295
296 /*
297 * probe and init (aux_dev_id argument is required by function prototype but not used)
298 */
intel_link_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * aux_dev_id)299 static int intel_link_probe(struct auxiliary_device *auxdev,
300 const struct auxiliary_device_id *aux_dev_id)
301
302 {
303 struct device *dev = &auxdev->dev;
304 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
305 struct sdw_intel *sdw;
306 struct sdw_cdns *cdns;
307 struct sdw_bus *bus;
308 int ret;
309
310 sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
311 if (!sdw)
312 return -ENOMEM;
313
314 cdns = &sdw->cdns;
315 bus = &cdns->bus;
316
317 sdw->instance = auxdev->id;
318 sdw->link_res = &ldev->link_res;
319 cdns->dev = dev;
320 cdns->registers = sdw->link_res->registers;
321 cdns->ip_offset = sdw->link_res->ip_offset;
322 cdns->instance = sdw->instance;
323 cdns->msg_count = 0;
324
325 /* single controller for all SoundWire links */
326 bus->controller_id = 0;
327
328 bus->link_id = auxdev->id;
329 bus->clk_stop_timeout = 1;
330
331 /*
332 * paranoia check: make sure ACPI-reported number of links is aligned with
333 * hardware capabilities.
334 */
335 ret = sdw_intel_get_link_count(sdw);
336 if (ret < 0) {
337 dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);
338 return ret;
339 }
340 if (ret <= sdw->instance) {
341 dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);
342 return -EINVAL;
343 }
344
345 sdw_cdns_probe(cdns);
346
347 /* Set ops */
348 bus->ops = &sdw_intel_ops;
349
350 /* set driver data, accessed by snd_soc_dai_get_drvdata() */
351 auxiliary_set_drvdata(auxdev, cdns);
352
353 /* use generic bandwidth allocation algorithm */
354 sdw->cdns.bus.compute_params = sdw_compute_params;
355
356 ret = sdw_bus_master_add(bus, dev, dev->fwnode);
357 if (ret) {
358 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
359 return ret;
360 }
361
362 if (bus->prop.hw_disabled)
363 dev_info(dev,
364 "SoundWire master %d is disabled, will be ignored\n",
365 bus->link_id);
366 /*
367 * Ignore BIOS err_threshold, it's a really bad idea when dealing
368 * with multiple hardware synchronized links
369 */
370 bus->prop.err_threshold = 0;
371
372 return 0;
373 }
374
intel_link_startup(struct auxiliary_device * auxdev)375 int intel_link_startup(struct auxiliary_device *auxdev)
376 {
377 struct device *dev = &auxdev->dev;
378 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
379 struct sdw_intel *sdw = cdns_to_intel(cdns);
380 struct sdw_bus *bus = &cdns->bus;
381 int link_flags;
382 bool multi_link;
383 u32 clock_stop_quirks;
384 int ret;
385
386 if (bus->prop.hw_disabled) {
387 dev_info(dev,
388 "SoundWire master %d is disabled, ignoring\n",
389 sdw->instance);
390 return 0;
391 }
392
393 link_flags = md_flags >> (bus->link_id * 8);
394 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
395 if (!multi_link) {
396 dev_dbg(dev, "Multi-link is disabled\n");
397 } else {
398 /*
399 * hardware-based synchronization is required regardless
400 * of the number of segments used by a stream: SSP-based
401 * synchronization is gated by gsync when the multi-master
402 * mode is set.
403 */
404 bus->hw_sync_min_links = 1;
405 }
406 bus->multi_link = multi_link;
407
408 /* Initialize shim, controller */
409 ret = sdw_intel_link_power_up(sdw);
410 if (ret)
411 goto err_init;
412
413 /* Register DAIs */
414 ret = sdw_intel_register_dai(sdw);
415 if (ret) {
416 dev_err(dev, "DAI registration failed: %d\n", ret);
417 goto err_power_up;
418 }
419
420 sdw_intel_debugfs_init(sdw);
421
422 /* Enable runtime PM */
423 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
424 pm_runtime_set_autosuspend_delay(dev,
425 INTEL_MASTER_SUSPEND_DELAY_MS);
426 pm_runtime_use_autosuspend(dev);
427 pm_runtime_mark_last_busy(dev);
428
429 pm_runtime_set_active(dev);
430 pm_runtime_enable(dev);
431
432 pm_runtime_resume(bus->dev);
433 }
434
435 /* start bus */
436 ret = sdw_intel_start_bus(sdw);
437 if (ret) {
438 dev_err(dev, "bus start failed: %d\n", ret);
439 goto err_pm_runtime;
440 }
441
442 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
443 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
444 /*
445 * To keep the clock running we need to prevent
446 * pm_runtime suspend from happening by increasing the
447 * reference count.
448 * This quirk is specified by the parent PCI device in
449 * case of specific latency requirements. It will have
450 * no effect if pm_runtime is disabled by the user via
451 * a module parameter for testing purposes.
452 */
453 pm_runtime_get_noresume(dev);
454 }
455
456 /*
457 * The runtime PM status of Slave devices is "Unsupported"
458 * until they report as ATTACHED. If they don't, e.g. because
459 * there are no Slave devices populated or if the power-on is
460 * delayed or dependent on a power switch, the Master will
461 * remain active and prevent its parent from suspending.
462 *
463 * Conditionally force the pm_runtime core to re-evaluate the
464 * Master status in the absence of any Slave activity. A quirk
465 * is provided to e.g. deal with Slaves that may be powered on
466 * with a delay. A more complete solution would require the
467 * definition of Master properties.
468 */
469 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
470 pm_runtime_mark_last_busy(bus->dev);
471 pm_runtime_mark_last_busy(dev);
472 pm_runtime_idle(dev);
473 }
474
475 sdw->startup_done = true;
476 return 0;
477
478 err_pm_runtime:
479 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
480 pm_runtime_disable(dev);
481 err_power_up:
482 sdw_intel_link_power_down(sdw);
483 err_init:
484 return ret;
485 }
486
intel_link_remove(struct auxiliary_device * auxdev)487 static void intel_link_remove(struct auxiliary_device *auxdev)
488 {
489 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
490 struct sdw_intel *sdw = cdns_to_intel(cdns);
491 struct sdw_bus *bus = &cdns->bus;
492
493 /*
494 * Since pm_runtime is already disabled, we don't decrease
495 * the refcount when the clock_stop_quirk is
496 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
497 */
498 if (!bus->prop.hw_disabled) {
499 sdw_intel_debugfs_exit(sdw);
500 cancel_delayed_work_sync(&cdns->attach_dwork);
501 sdw_cdns_enable_interrupt(cdns, false);
502 }
503 sdw_bus_master_delete(bus);
504 }
505
intel_link_process_wakeen_event(struct auxiliary_device * auxdev)506 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
507 {
508 struct device *dev = &auxdev->dev;
509 struct sdw_intel *sdw;
510 struct sdw_bus *bus;
511
512 sdw = auxiliary_get_drvdata(auxdev);
513 bus = &sdw->cdns.bus;
514
515 if (bus->prop.hw_disabled || !sdw->startup_done) {
516 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
517 bus->link_id);
518 return 0;
519 }
520
521 if (!sdw_intel_shim_check_wake(sdw))
522 return 0;
523
524 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
525 sdw_intel_shim_wake(sdw, false);
526
527 /*
528 * resume the Master, which will generate a bus reset and result in
529 * Slaves re-attaching and be re-enumerated. The SoundWire physical
530 * device which generated the wake will trigger an interrupt, which
531 * will in turn cause the corresponding Linux Slave device to be
532 * resumed and the Slave codec driver to check the status.
533 */
534 pm_request_resume(dev);
535
536 return 0;
537 }
538
539 /*
540 * PM calls
541 */
542
intel_resume_child_device(struct device * dev,void * data)543 int intel_resume_child_device(struct device *dev, void *data)
544 {
545 int ret;
546 struct sdw_slave *slave = dev_to_sdw_dev(dev);
547
548 if (!slave->probed) {
549 dev_dbg(dev, "skipping device, no probed driver\n");
550 return 0;
551 }
552 if (!slave->dev_num_sticky) {
553 dev_dbg(dev, "skipping device, never detected on bus\n");
554 return 0;
555 }
556
557 ret = pm_runtime_resume(dev);
558 if (ret < 0) {
559 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
560 return ret;
561 }
562
563 return 0;
564 }
565
intel_pm_prepare(struct device * dev)566 static int __maybe_unused intel_pm_prepare(struct device *dev)
567 {
568 struct sdw_cdns *cdns = dev_get_drvdata(dev);
569 struct sdw_intel *sdw = cdns_to_intel(cdns);
570 struct sdw_bus *bus = &cdns->bus;
571 u32 clock_stop_quirks;
572 int ret;
573
574 if (bus->prop.hw_disabled || !sdw->startup_done) {
575 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
576 bus->link_id);
577 return 0;
578 }
579
580 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
581
582 if (pm_runtime_suspended(dev) &&
583 pm_runtime_suspended(dev->parent) &&
584 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
585 !clock_stop_quirks)) {
586 /*
587 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
588 * are not accessible and the shim wake cannot be disabled.
589 * The only solution is to resume the entire bus to full power
590 */
591
592 /*
593 * If any operation in this block fails, we keep going since we don't want
594 * to prevent system suspend from happening and errors should be recoverable
595 * on resume.
596 */
597
598 /*
599 * first resume the device for this link. This will also by construction
600 * resume the PCI parent device.
601 */
602 ret = pm_runtime_resume(dev);
603 if (ret < 0) {
604 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
605 return 0;
606 }
607
608 /*
609 * Continue resuming the entire bus (parent + child devices) to exit
610 * the clock stop mode. If there are no devices connected on this link
611 * this is a no-op.
612 * The resume to full power could have been implemented with a .prepare
613 * step in SoundWire codec drivers. This would however require a lot
614 * of code to handle an Intel-specific corner case. It is simpler in
615 * practice to add a loop at the link level.
616 */
617 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
618
619 if (ret < 0)
620 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
621 }
622
623 return 0;
624 }
625
intel_suspend(struct device * dev)626 static int __maybe_unused intel_suspend(struct device *dev)
627 {
628 struct sdw_cdns *cdns = dev_get_drvdata(dev);
629 struct sdw_intel *sdw = cdns_to_intel(cdns);
630 struct sdw_bus *bus = &cdns->bus;
631 u32 clock_stop_quirks;
632 int ret;
633
634 if (bus->prop.hw_disabled || !sdw->startup_done) {
635 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
636 bus->link_id);
637 return 0;
638 }
639
640 /* Prevent runtime PM from racing with the code below. */
641 pm_runtime_disable(dev);
642
643 if (pm_runtime_status_suspended(dev)) {
644 dev_dbg(dev, "pm_runtime status: suspended\n");
645
646 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
647
648 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
649 !clock_stop_quirks) {
650
651 if (pm_runtime_status_suspended(dev->parent)) {
652 /*
653 * paranoia check: this should not happen with the .prepare
654 * resume to full power
655 */
656 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
657 } else {
658 sdw_intel_shim_wake(sdw, false);
659 }
660 }
661
662 return 0;
663 }
664
665 ret = sdw_intel_stop_bus(sdw, false);
666 if (ret < 0) {
667 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
668 return ret;
669 }
670
671 return 0;
672 }
673
intel_suspend_runtime(struct device * dev)674 static int __maybe_unused intel_suspend_runtime(struct device *dev)
675 {
676 struct sdw_cdns *cdns = dev_get_drvdata(dev);
677 struct sdw_intel *sdw = cdns_to_intel(cdns);
678 struct sdw_bus *bus = &cdns->bus;
679 u32 clock_stop_quirks;
680 int ret;
681
682 if (bus->prop.hw_disabled || !sdw->startup_done) {
683 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
684 bus->link_id);
685 return 0;
686 }
687
688 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
689
690 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
691 ret = sdw_intel_stop_bus(sdw, false);
692 if (ret < 0) {
693 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
694 __func__, ret);
695 return ret;
696 }
697 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
698 ret = sdw_intel_stop_bus(sdw, true);
699 if (ret < 0) {
700 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
701 __func__, ret);
702 return ret;
703 }
704 } else {
705 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
706 __func__, clock_stop_quirks);
707 ret = -EINVAL;
708 }
709
710 return ret;
711 }
712
intel_resume(struct device * dev)713 static int __maybe_unused intel_resume(struct device *dev)
714 {
715 struct sdw_cdns *cdns = dev_get_drvdata(dev);
716 struct sdw_intel *sdw = cdns_to_intel(cdns);
717 struct sdw_bus *bus = &cdns->bus;
718 int ret;
719
720 if (bus->prop.hw_disabled || !sdw->startup_done) {
721 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
722 bus->link_id);
723 return 0;
724 }
725
726 ret = sdw_intel_link_power_up(sdw);
727 if (ret) {
728 dev_err(dev, "%s failed: %d\n", __func__, ret);
729 return ret;
730 }
731
732 /*
733 * make sure all Slaves are tagged as UNATTACHED and provide
734 * reason for reinitialization
735 */
736 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
737
738 ret = sdw_intel_start_bus(sdw);
739 if (ret < 0) {
740 dev_err(dev, "cannot start bus during resume\n");
741 sdw_intel_link_power_down(sdw);
742 return ret;
743 }
744
745 /*
746 * Runtime PM has been disabled in intel_suspend(), so set the status
747 * to active because the device has just been resumed and re-enable
748 * runtime PM.
749 */
750 pm_runtime_set_active(dev);
751 pm_runtime_enable(dev);
752
753 /*
754 * after system resume, the pm_runtime suspend() may kick in
755 * during the enumeration, before any children device force the
756 * master device to remain active. Using pm_runtime_get()
757 * routines is not really possible, since it'd prevent the
758 * master from suspending.
759 * A reasonable compromise is to update the pm_runtime
760 * counters and delay the pm_runtime suspend by several
761 * seconds, by when all enumeration should be complete.
762 */
763 pm_runtime_mark_last_busy(bus->dev);
764 pm_runtime_mark_last_busy(dev);
765
766 return 0;
767 }
768
intel_resume_runtime(struct device * dev)769 static int __maybe_unused intel_resume_runtime(struct device *dev)
770 {
771 struct sdw_cdns *cdns = dev_get_drvdata(dev);
772 struct sdw_intel *sdw = cdns_to_intel(cdns);
773 struct sdw_bus *bus = &cdns->bus;
774 u32 clock_stop_quirks;
775 int ret;
776
777 if (bus->prop.hw_disabled || !sdw->startup_done) {
778 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
779 bus->link_id);
780 return 0;
781 }
782
783 /* unconditionally disable WAKEEN interrupt */
784 sdw_intel_shim_wake(sdw, false);
785
786 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
787
788 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
789 ret = sdw_intel_link_power_up(sdw);
790 if (ret) {
791 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
792 return ret;
793 }
794
795 /*
796 * make sure all Slaves are tagged as UNATTACHED and provide
797 * reason for reinitialization
798 */
799 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
800
801 ret = sdw_intel_start_bus(sdw);
802 if (ret < 0) {
803 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
804 sdw_intel_link_power_down(sdw);
805 return ret;
806 }
807
808 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
809 ret = sdw_intel_link_power_up(sdw);
810 if (ret) {
811 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
812 return ret;
813 }
814
815 ret = sdw_intel_start_bus_after_reset(sdw);
816 if (ret < 0) {
817 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
818 sdw_intel_link_power_down(sdw);
819 return ret;
820 }
821 } else if (!clock_stop_quirks) {
822
823 sdw_intel_check_clock_stop(sdw);
824
825 ret = sdw_intel_link_power_up(sdw);
826 if (ret) {
827 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
828 return ret;
829 }
830
831 ret = sdw_intel_start_bus_after_clock_stop(sdw);
832 if (ret < 0) {
833 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
834 sdw_intel_link_power_down(sdw);
835 return ret;
836 }
837 } else {
838 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
839 __func__, clock_stop_quirks);
840 ret = -EINVAL;
841 }
842
843 return ret;
844 }
845
846 static const struct dev_pm_ops intel_pm = {
847 .prepare = intel_pm_prepare,
848 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
849 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
850 };
851
852 static const struct auxiliary_device_id intel_link_id_table[] = {
853 { .name = "soundwire_intel.link" },
854 {},
855 };
856 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
857
858 static struct auxiliary_driver sdw_intel_drv = {
859 .probe = intel_link_probe,
860 .remove = intel_link_remove,
861 .driver = {
862 /* auxiliary_driver_register() sets .name to be the modname */
863 .pm = &intel_pm,
864 },
865 .id_table = intel_link_id_table
866 };
867 module_auxiliary_driver(sdw_intel_drv);
868
869 MODULE_LICENSE("Dual BSD/GPL");
870 MODULE_DESCRIPTION("Intel Soundwire Link Driver");
871