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 {0x01fa, 0x4243},
51 {0x025d, 0x5682},
52 {0x025d, 0x700},
53 {0x025d, 0x711},
54 {0x025d, 0x1712},
55 {0x025d, 0x1713},
56 {0x025d, 0x1716},
57 {0x025d, 0x1717},
58 {0x025d, 0x712},
59 {0x025d, 0x713},
60 {0x025d, 0x714},
61 {0x025d, 0x715},
62 {0x025d, 0x716},
63 {0x025d, 0x717},
64 {0x025d, 0x722},
65 };
66
is_wake_capable(struct sdw_slave * slave)67 static bool is_wake_capable(struct sdw_slave *slave)
68 {
69 int i;
70
71 for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)
72 if (slave->id.part_id == wake_capable_list[i].part_id &&
73 slave->id.mfg_id == wake_capable_list[i].mfg_id)
74 return true;
75 return false;
76 }
77
generic_pre_bank_switch(struct sdw_bus * bus)78 static int generic_pre_bank_switch(struct sdw_bus *bus)
79 {
80 struct sdw_cdns *cdns = bus_to_cdns(bus);
81 struct sdw_intel *sdw = cdns_to_intel(cdns);
82
83 return sdw->link_res->hw_ops->pre_bank_switch(sdw);
84 }
85
generic_post_bank_switch(struct sdw_bus * bus)86 static int generic_post_bank_switch(struct sdw_bus *bus)
87 {
88 struct sdw_cdns *cdns = bus_to_cdns(bus);
89 struct sdw_intel *sdw = cdns_to_intel(cdns);
90
91 return sdw->link_res->hw_ops->post_bank_switch(sdw);
92 }
93
generic_new_peripheral_assigned(struct sdw_bus * bus,struct sdw_slave * slave,int dev_num)94 static void generic_new_peripheral_assigned(struct sdw_bus *bus,
95 struct sdw_slave *slave,
96 int dev_num)
97 {
98 struct sdw_cdns *cdns = bus_to_cdns(bus);
99 struct sdw_intel *sdw = cdns_to_intel(cdns);
100 int dev_num_min;
101 int dev_num_max;
102 bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);
103
104 if (wake_capable) {
105 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;
106 dev_num_max = SDW_MAX_DEVICES;
107 } else {
108 dev_num_min = 1;
109 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;
110 }
111
112 /* paranoia check, this should never happen */
113 if (dev_num < dev_num_min || dev_num > dev_num_max) {
114 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",
115 __func__, dev_num, slave->prop.wake_capable);
116 return;
117 }
118
119 if (sdw->link_res->hw_ops->program_sdi && wake_capable)
120 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);
121 }
122
sdw_master_read_intel_prop(struct sdw_bus * bus)123 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
124 {
125 struct sdw_master_prop *prop = &bus->prop;
126 struct sdw_intel_prop *intel_prop;
127 struct fwnode_handle *link;
128 char name[32];
129 u32 quirk_mask;
130
131 /* Find master handle */
132 snprintf(name, sizeof(name),
133 "mipi-sdw-link-%d-subproperties", bus->link_id);
134
135 link = device_get_named_child_node(bus->dev, name);
136 if (!link) {
137 dev_err(bus->dev, "Master node %s not found\n", name);
138 return -EIO;
139 }
140
141 fwnode_property_read_u32(link,
142 "intel-sdw-ip-clock",
143 &prop->mclk_freq);
144
145 /* the values reported by BIOS are the 2x clock, not the bus clock */
146 prop->mclk_freq /= 2;
147
148 fwnode_property_read_u32(link,
149 "intel-quirk-mask",
150 &quirk_mask);
151
152 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
153 prop->hw_disabled = true;
154
155 prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
156 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
157
158 intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);
159 if (!intel_prop) {
160 fwnode_handle_put(link);
161 return -ENOMEM;
162 }
163
164 /* initialize with hardware defaults, in case the properties are not found */
165 intel_prop->clde = 0x0;
166 intel_prop->doaise2 = 0x0;
167 intel_prop->dodse2 = 0x0;
168 intel_prop->clds = 0x0;
169 intel_prop->clss = 0x0;
170 intel_prop->doaise = 0x1;
171 intel_prop->doais = 0x3;
172 intel_prop->dodse = 0x0;
173 intel_prop->dods = 0x1;
174
175 fwnode_property_read_u16(link,
176 "intel-sdw-clde",
177 &intel_prop->clde);
178 fwnode_property_read_u16(link,
179 "intel-sdw-doaise2",
180 &intel_prop->doaise2);
181 fwnode_property_read_u16(link,
182 "intel-sdw-dodse2",
183 &intel_prop->dodse2);
184 fwnode_property_read_u16(link,
185 "intel-sdw-clds",
186 &intel_prop->clds);
187 fwnode_property_read_u16(link,
188 "intel-sdw-clss",
189 &intel_prop->clss);
190 fwnode_property_read_u16(link,
191 "intel-sdw-doaise",
192 &intel_prop->doaise);
193 fwnode_property_read_u16(link,
194 "intel-sdw-doais",
195 &intel_prop->doais);
196 fwnode_property_read_u16(link,
197 "intel-sdw-dodse",
198 &intel_prop->dodse);
199 fwnode_property_read_u16(link,
200 "intel-sdw-dods",
201 &intel_prop->dods);
202 bus->vendor_specific_prop = intel_prop;
203
204 dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n",
205 intel_prop->doaise,
206 intel_prop->doais,
207 intel_prop->dodse,
208 intel_prop->dods);
209
210 fwnode_handle_put(link);
211
212 return 0;
213 }
214
intel_prop_read(struct sdw_bus * bus)215 static int intel_prop_read(struct sdw_bus *bus)
216 {
217 struct sdw_master_prop *prop;
218
219 /* Initialize with default handler to read all DisCo properties */
220 sdw_master_read_prop(bus);
221
222 /*
223 * Only one bus frequency is supported so far, filter
224 * frequencies reported in the DSDT
225 */
226 prop = &bus->prop;
227 if (prop->clk_freq && prop->num_clk_freq > 1) {
228 unsigned int default_bus_frequency;
229
230 default_bus_frequency =
231 prop->default_frame_rate *
232 prop->default_row *
233 prop->default_col /
234 SDW_DOUBLE_RATE_FACTOR;
235
236 prop->num_clk_freq = 1;
237 prop->clk_freq[0] = default_bus_frequency;
238 prop->max_clk_freq = default_bus_frequency;
239 }
240
241 /* read Intel-specific properties */
242 sdw_master_read_intel_prop(bus);
243
244 return 0;
245 }
246
247 static DEFINE_IDA(intel_peripheral_ida);
248
intel_get_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)249 static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
250 {
251 int bit;
252
253 if (slave->prop.wake_capable || is_wake_capable(slave))
254 return ida_alloc_range(&intel_peripheral_ida,
255 SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
256 GFP_KERNEL);
257
258 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
259 if (bit == SDW_MAX_DEVICES)
260 return -ENODEV;
261
262 return bit;
263 }
264
intel_put_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)265 static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
266 {
267 if (slave->prop.wake_capable || is_wake_capable(slave))
268 ida_free(&intel_peripheral_ida, slave->dev_num);
269 }
270
271 static struct sdw_master_ops sdw_intel_ops = {
272 .read_prop = intel_prop_read,
273 .override_adr = sdw_dmi_override_adr,
274 .xfer_msg = cdns_xfer_msg,
275 .xfer_msg_defer = cdns_xfer_msg_defer,
276 .set_bus_conf = cdns_bus_conf,
277 .pre_bank_switch = generic_pre_bank_switch,
278 .post_bank_switch = generic_post_bank_switch,
279 .read_ping_status = cdns_read_ping_status,
280 .get_device_num = intel_get_device_num_ida,
281 .put_device_num = intel_put_device_num_ida,
282 .new_peripheral_assigned = generic_new_peripheral_assigned,
283 };
284
285 /*
286 * probe and init (aux_dev_id argument is required by function prototype but not used)
287 */
intel_link_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * aux_dev_id)288 static int intel_link_probe(struct auxiliary_device *auxdev,
289 const struct auxiliary_device_id *aux_dev_id)
290
291 {
292 struct device *dev = &auxdev->dev;
293 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
294 struct sdw_intel *sdw;
295 struct sdw_cdns *cdns;
296 struct sdw_bus *bus;
297 int ret;
298
299 sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
300 if (!sdw)
301 return -ENOMEM;
302
303 cdns = &sdw->cdns;
304 bus = &cdns->bus;
305
306 sdw->instance = auxdev->id;
307 sdw->link_res = &ldev->link_res;
308 cdns->dev = dev;
309 cdns->registers = sdw->link_res->registers;
310 cdns->ip_offset = sdw->link_res->ip_offset;
311 cdns->instance = sdw->instance;
312 cdns->msg_count = 0;
313
314 /* single controller for all SoundWire links */
315 bus->controller_id = 0;
316
317 bus->link_id = auxdev->id;
318 bus->clk_stop_timeout = 1;
319
320 /*
321 * paranoia check: make sure ACPI-reported number of links is aligned with
322 * hardware capabilities.
323 */
324 ret = sdw_intel_get_link_count(sdw);
325 if (ret < 0) {
326 dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);
327 return ret;
328 }
329 if (ret <= sdw->instance) {
330 dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);
331 return -EINVAL;
332 }
333
334 sdw_cdns_probe(cdns);
335
336 /* Set ops */
337 bus->ops = &sdw_intel_ops;
338
339 /* set driver data, accessed by snd_soc_dai_get_drvdata() */
340 auxiliary_set_drvdata(auxdev, cdns);
341
342 /* use generic bandwidth allocation algorithm */
343 sdw->cdns.bus.compute_params = sdw_compute_params;
344
345 /* avoid resuming from pm_runtime suspend if it's not required */
346 dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
347
348 ret = sdw_bus_master_add(bus, dev, dev->fwnode);
349 if (ret) {
350 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
351 return ret;
352 }
353
354 if (bus->prop.hw_disabled)
355 dev_info(dev,
356 "SoundWire master %d is disabled, will be ignored\n",
357 bus->link_id);
358 /*
359 * Ignore BIOS err_threshold, it's a really bad idea when dealing
360 * with multiple hardware synchronized links
361 */
362 bus->prop.err_threshold = 0;
363
364 return 0;
365 }
366
intel_link_startup(struct auxiliary_device * auxdev)367 int intel_link_startup(struct auxiliary_device *auxdev)
368 {
369 struct device *dev = &auxdev->dev;
370 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
371 struct sdw_intel *sdw = cdns_to_intel(cdns);
372 struct sdw_bus *bus = &cdns->bus;
373 int link_flags;
374 bool multi_link;
375 u32 clock_stop_quirks;
376 int ret;
377
378 if (bus->prop.hw_disabled) {
379 dev_info(dev,
380 "SoundWire master %d is disabled, ignoring\n",
381 sdw->instance);
382 return 0;
383 }
384
385 link_flags = md_flags >> (bus->link_id * 8);
386 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
387 if (!multi_link) {
388 dev_dbg(dev, "Multi-link is disabled\n");
389 } else {
390 /*
391 * hardware-based synchronization is required regardless
392 * of the number of segments used by a stream: SSP-based
393 * synchronization is gated by gsync when the multi-master
394 * mode is set.
395 */
396 bus->hw_sync_min_links = 1;
397 }
398 bus->multi_link = multi_link;
399
400 /* Initialize shim, controller */
401 ret = sdw_intel_link_power_up(sdw);
402 if (ret)
403 goto err_init;
404
405 /* Register DAIs */
406 ret = sdw_intel_register_dai(sdw);
407 if (ret) {
408 dev_err(dev, "DAI registration failed: %d\n", ret);
409 goto err_power_up;
410 }
411
412 sdw_intel_debugfs_init(sdw);
413
414 /* Enable runtime PM */
415 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
416 pm_runtime_set_autosuspend_delay(dev,
417 INTEL_MASTER_SUSPEND_DELAY_MS);
418 pm_runtime_use_autosuspend(dev);
419 pm_runtime_mark_last_busy(dev);
420
421 pm_runtime_set_active(dev);
422 pm_runtime_enable(dev);
423
424 pm_runtime_resume(bus->dev);
425 }
426
427 /* start bus */
428 ret = sdw_intel_start_bus(sdw);
429 if (ret) {
430 dev_err(dev, "bus start failed: %d\n", ret);
431 goto err_pm_runtime;
432 }
433
434 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
435 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
436 /*
437 * To keep the clock running we need to prevent
438 * pm_runtime suspend from happening by increasing the
439 * reference count.
440 * This quirk is specified by the parent PCI device in
441 * case of specific latency requirements. It will have
442 * no effect if pm_runtime is disabled by the user via
443 * a module parameter for testing purposes.
444 */
445 pm_runtime_get_noresume(dev);
446 }
447
448 /*
449 * The runtime PM status of Slave devices is "Unsupported"
450 * until they report as ATTACHED. If they don't, e.g. because
451 * there are no Slave devices populated or if the power-on is
452 * delayed or dependent on a power switch, the Master will
453 * remain active and prevent its parent from suspending.
454 *
455 * Conditionally force the pm_runtime core to re-evaluate the
456 * Master status in the absence of any Slave activity. A quirk
457 * is provided to e.g. deal with Slaves that may be powered on
458 * with a delay. A more complete solution would require the
459 * definition of Master properties.
460 */
461 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
462 pm_runtime_mark_last_busy(bus->dev);
463 pm_runtime_mark_last_busy(dev);
464 pm_runtime_idle(dev);
465 }
466
467 sdw->startup_done = true;
468 return 0;
469
470 err_pm_runtime:
471 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
472 pm_runtime_disable(dev);
473 err_power_up:
474 sdw_intel_link_power_down(sdw);
475 err_init:
476 return ret;
477 }
478
intel_link_remove(struct auxiliary_device * auxdev)479 static void intel_link_remove(struct auxiliary_device *auxdev)
480 {
481 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
482 struct sdw_intel *sdw = cdns_to_intel(cdns);
483 struct sdw_bus *bus = &cdns->bus;
484
485 /*
486 * Since pm_runtime is already disabled, we don't decrease
487 * the refcount when the clock_stop_quirk is
488 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
489 */
490 if (!bus->prop.hw_disabled) {
491 sdw_intel_debugfs_exit(sdw);
492 cancel_delayed_work_sync(&cdns->attach_dwork);
493 sdw_cdns_enable_interrupt(cdns, false);
494 }
495 sdw_bus_master_delete(bus);
496 }
497
intel_link_process_wakeen_event(struct auxiliary_device * auxdev)498 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
499 {
500 struct device *dev = &auxdev->dev;
501 struct sdw_intel *sdw;
502 struct sdw_bus *bus;
503
504 sdw = auxiliary_get_drvdata(auxdev);
505 bus = &sdw->cdns.bus;
506
507 if (bus->prop.hw_disabled || !sdw->startup_done) {
508 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
509 bus->link_id);
510 return 0;
511 }
512
513 if (!sdw_intel_shim_check_wake(sdw))
514 return 0;
515
516 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
517 sdw_intel_shim_wake(sdw, false);
518
519 /*
520 * resume the Master, which will generate a bus reset and result in
521 * Slaves re-attaching and be re-enumerated. The SoundWire physical
522 * device which generated the wake will trigger an interrupt, which
523 * will in turn cause the corresponding Linux Slave device to be
524 * resumed and the Slave codec driver to check the status.
525 */
526 pm_request_resume(dev);
527
528 return 0;
529 }
530
531 /*
532 * PM calls
533 */
534
intel_resume_child_device(struct device * dev,void * data)535 int intel_resume_child_device(struct device *dev, void *data)
536 {
537 int ret;
538 struct sdw_slave *slave = dev_to_sdw_dev(dev);
539
540 if (!slave->probed) {
541 dev_dbg(dev, "skipping device, no probed driver\n");
542 return 0;
543 }
544 if (!slave->dev_num_sticky) {
545 dev_dbg(dev, "skipping device, never detected on bus\n");
546 return 0;
547 }
548
549 ret = pm_runtime_resume(dev);
550 if (ret < 0) {
551 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
552 return ret;
553 }
554
555 return 0;
556 }
557
intel_pm_prepare(struct device * dev)558 static int __maybe_unused intel_pm_prepare(struct device *dev)
559 {
560 struct sdw_cdns *cdns = dev_get_drvdata(dev);
561 struct sdw_intel *sdw = cdns_to_intel(cdns);
562 struct sdw_bus *bus = &cdns->bus;
563 u32 clock_stop_quirks;
564 int ret;
565
566 if (bus->prop.hw_disabled || !sdw->startup_done) {
567 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
568 bus->link_id);
569 return 0;
570 }
571
572 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
573
574 if (pm_runtime_suspended(dev) &&
575 pm_runtime_suspended(dev->parent) &&
576 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
577 !clock_stop_quirks)) {
578 /*
579 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
580 * are not accessible and the shim wake cannot be disabled.
581 * The only solution is to resume the entire bus to full power
582 */
583
584 /*
585 * If any operation in this block fails, we keep going since we don't want
586 * to prevent system suspend from happening and errors should be recoverable
587 * on resume.
588 */
589
590 /*
591 * first resume the device for this link. This will also by construction
592 * resume the PCI parent device.
593 */
594 ret = pm_runtime_resume(dev);
595 if (ret < 0) {
596 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
597 return 0;
598 }
599
600 /*
601 * Continue resuming the entire bus (parent + child devices) to exit
602 * the clock stop mode. If there are no devices connected on this link
603 * this is a no-op.
604 * The resume to full power could have been implemented with a .prepare
605 * step in SoundWire codec drivers. This would however require a lot
606 * of code to handle an Intel-specific corner case. It is simpler in
607 * practice to add a loop at the link level.
608 */
609 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
610
611 if (ret < 0)
612 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
613 }
614
615 return 0;
616 }
617
intel_suspend(struct device * dev)618 static int __maybe_unused intel_suspend(struct device *dev)
619 {
620 struct sdw_cdns *cdns = dev_get_drvdata(dev);
621 struct sdw_intel *sdw = cdns_to_intel(cdns);
622 struct sdw_bus *bus = &cdns->bus;
623 u32 clock_stop_quirks;
624 int ret;
625
626 if (bus->prop.hw_disabled || !sdw->startup_done) {
627 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
628 bus->link_id);
629 return 0;
630 }
631
632 if (pm_runtime_suspended(dev)) {
633 dev_dbg(dev, "pm_runtime status: suspended\n");
634
635 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
636
637 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
638 !clock_stop_quirks) {
639
640 if (pm_runtime_suspended(dev->parent)) {
641 /*
642 * paranoia check: this should not happen with the .prepare
643 * resume to full power
644 */
645 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
646 } else {
647 sdw_intel_shim_wake(sdw, false);
648 }
649 }
650
651 return 0;
652 }
653
654 ret = sdw_intel_stop_bus(sdw, false);
655 if (ret < 0) {
656 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
657 return ret;
658 }
659
660 return 0;
661 }
662
intel_suspend_runtime(struct device * dev)663 static int __maybe_unused intel_suspend_runtime(struct device *dev)
664 {
665 struct sdw_cdns *cdns = dev_get_drvdata(dev);
666 struct sdw_intel *sdw = cdns_to_intel(cdns);
667 struct sdw_bus *bus = &cdns->bus;
668 u32 clock_stop_quirks;
669 int ret;
670
671 if (bus->prop.hw_disabled || !sdw->startup_done) {
672 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
673 bus->link_id);
674 return 0;
675 }
676
677 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
678
679 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
680 ret = sdw_intel_stop_bus(sdw, false);
681 if (ret < 0) {
682 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
683 __func__, ret);
684 return ret;
685 }
686 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
687 ret = sdw_intel_stop_bus(sdw, true);
688 if (ret < 0) {
689 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
690 __func__, ret);
691 return ret;
692 }
693 } else {
694 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
695 __func__, clock_stop_quirks);
696 ret = -EINVAL;
697 }
698
699 return ret;
700 }
701
intel_resume(struct device * dev)702 static int __maybe_unused intel_resume(struct device *dev)
703 {
704 struct sdw_cdns *cdns = dev_get_drvdata(dev);
705 struct sdw_intel *sdw = cdns_to_intel(cdns);
706 struct sdw_bus *bus = &cdns->bus;
707 int link_flags;
708 int ret;
709
710 if (bus->prop.hw_disabled || !sdw->startup_done) {
711 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
712 bus->link_id);
713 return 0;
714 }
715
716 if (pm_runtime_suspended(dev)) {
717 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");
718
719 /* follow required sequence from runtime_pm.rst */
720 pm_runtime_disable(dev);
721 pm_runtime_set_active(dev);
722 pm_runtime_mark_last_busy(dev);
723 pm_runtime_enable(dev);
724
725 pm_runtime_resume(bus->dev);
726
727 link_flags = md_flags >> (bus->link_id * 8);
728
729 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
730 pm_runtime_idle(dev);
731 }
732
733 ret = sdw_intel_link_power_up(sdw);
734 if (ret) {
735 dev_err(dev, "%s failed: %d\n", __func__, ret);
736 return ret;
737 }
738
739 /*
740 * make sure all Slaves are tagged as UNATTACHED and provide
741 * reason for reinitialization
742 */
743 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
744
745 ret = sdw_intel_start_bus(sdw);
746 if (ret < 0) {
747 dev_err(dev, "cannot start bus during resume\n");
748 sdw_intel_link_power_down(sdw);
749 return ret;
750 }
751
752 /*
753 * after system resume, the pm_runtime suspend() may kick in
754 * during the enumeration, before any children device force the
755 * master device to remain active. Using pm_runtime_get()
756 * routines is not really possible, since it'd prevent the
757 * master from suspending.
758 * A reasonable compromise is to update the pm_runtime
759 * counters and delay the pm_runtime suspend by several
760 * seconds, by when all enumeration should be complete.
761 */
762 pm_runtime_mark_last_busy(bus->dev);
763 pm_runtime_mark_last_busy(dev);
764
765 return 0;
766 }
767
intel_resume_runtime(struct device * dev)768 static int __maybe_unused intel_resume_runtime(struct device *dev)
769 {
770 struct sdw_cdns *cdns = dev_get_drvdata(dev);
771 struct sdw_intel *sdw = cdns_to_intel(cdns);
772 struct sdw_bus *bus = &cdns->bus;
773 u32 clock_stop_quirks;
774 int ret;
775
776 if (bus->prop.hw_disabled || !sdw->startup_done) {
777 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
778 bus->link_id);
779 return 0;
780 }
781
782 /* unconditionally disable WAKEEN interrupt */
783 sdw_intel_shim_wake(sdw, false);
784
785 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
786
787 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
788 ret = sdw_intel_link_power_up(sdw);
789 if (ret) {
790 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
791 return ret;
792 }
793
794 /*
795 * make sure all Slaves are tagged as UNATTACHED and provide
796 * reason for reinitialization
797 */
798 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
799
800 ret = sdw_intel_start_bus(sdw);
801 if (ret < 0) {
802 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
803 sdw_intel_link_power_down(sdw);
804 return ret;
805 }
806
807 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
808 ret = sdw_intel_link_power_up(sdw);
809 if (ret) {
810 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
811 return ret;
812 }
813
814 ret = sdw_intel_start_bus_after_reset(sdw);
815 if (ret < 0) {
816 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
817 sdw_intel_link_power_down(sdw);
818 return ret;
819 }
820 } else if (!clock_stop_quirks) {
821
822 sdw_intel_check_clock_stop(sdw);
823
824 ret = sdw_intel_link_power_up(sdw);
825 if (ret) {
826 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
827 return ret;
828 }
829
830 ret = sdw_intel_start_bus_after_clock_stop(sdw);
831 if (ret < 0) {
832 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
833 sdw_intel_link_power_down(sdw);
834 return ret;
835 }
836 } else {
837 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
838 __func__, clock_stop_quirks);
839 ret = -EINVAL;
840 }
841
842 return ret;
843 }
844
845 static const struct dev_pm_ops intel_pm = {
846 .prepare = intel_pm_prepare,
847 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
848 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
849 };
850
851 static const struct auxiliary_device_id intel_link_id_table[] = {
852 { .name = "soundwire_intel.link" },
853 {},
854 };
855 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
856
857 static struct auxiliary_driver sdw_intel_drv = {
858 .probe = intel_link_probe,
859 .remove = intel_link_remove,
860 .driver = {
861 /* auxiliary_driver_register() sets .name to be the modname */
862 .pm = &intel_pm,
863 },
864 .id_table = intel_link_id_table
865 };
866 module_auxiliary_driver(sdw_intel_drv);
867
868 MODULE_LICENSE("Dual BSD/GPL");
869 MODULE_DESCRIPTION("Intel Soundwire Link Driver");
870