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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 | /* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */ | |
27 | #define INTEL_DEV_NUM_IDA_MIN 4 | |
28 | ||
29 | #define INTEL_MASTER_SUSPEND_DELAY_MS 3000 | |
30 | ||
31 | /* | |
32 | * debug/config flags for the Intel SoundWire Master. | |
33 | * | |
34 | * Since we may have multiple masters active, we can have up to 8 | |
35 | * flags reused in each byte, with master0 using the ls-byte, etc. | |
36 | */ | |
37 | ||
38 | #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME BIT(0) | |
39 | #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP BIT(1) | |
40 | #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE BIT(2) | |
41 | #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK BIT(3) | |
42 | ||
43 | static int md_flags; | |
44 | module_param_named(sdw_md_flags, md_flags, int, 0444); | |
45 | MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)"); | |
46 | ||
47 | static int generic_pre_bank_switch(struct sdw_bus *bus) | |
48 | { | |
49 | struct sdw_cdns *cdns = bus_to_cdns(bus); | |
50 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
51 | ||
52 | return sdw->link_res->hw_ops->pre_bank_switch(sdw); | |
53 | } | |
54 | ||
55 | static int generic_post_bank_switch(struct sdw_bus *bus) | |
56 | { | |
57 | struct sdw_cdns *cdns = bus_to_cdns(bus); | |
58 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
59 | ||
60 | return sdw->link_res->hw_ops->post_bank_switch(sdw); | |
61 | } | |
62 | ||
63 | static int sdw_master_read_intel_prop(struct sdw_bus *bus) | |
64 | { | |
65 | struct sdw_master_prop *prop = &bus->prop; | |
66 | struct fwnode_handle *link; | |
67 | char name[32]; | |
68 | u32 quirk_mask; | |
69 | ||
70 | /* Find master handle */ | |
71 | snprintf(name, sizeof(name), | |
72 | "mipi-sdw-link-%d-subproperties", bus->link_id); | |
73 | ||
74 | link = device_get_named_child_node(bus->dev, name); | |
75 | if (!link) { | |
76 | dev_err(bus->dev, "Master node %s not found\n", name); | |
77 | return -EIO; | |
78 | } | |
79 | ||
80 | fwnode_property_read_u32(link, | |
81 | "intel-sdw-ip-clock", | |
82 | &prop->mclk_freq); | |
83 | ||
84 | /* the values reported by BIOS are the 2x clock, not the bus clock */ | |
85 | prop->mclk_freq /= 2; | |
86 | ||
87 | fwnode_property_read_u32(link, | |
88 | "intel-quirk-mask", | |
89 | &quirk_mask); | |
90 | ||
91 | if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) | |
92 | prop->hw_disabled = true; | |
93 | ||
94 | prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH | | |
95 | SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int intel_prop_read(struct sdw_bus *bus) | |
101 | { | |
102 | /* Initialize with default handler to read all DisCo properties */ | |
103 | sdw_master_read_prop(bus); | |
104 | ||
105 | /* read Intel-specific properties */ | |
106 | sdw_master_read_intel_prop(bus); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static struct sdw_master_ops sdw_intel_ops = { | |
112 | .read_prop = intel_prop_read, | |
113 | .override_adr = sdw_dmi_override_adr, | |
114 | .xfer_msg = cdns_xfer_msg, | |
115 | .xfer_msg_defer = cdns_xfer_msg_defer, | |
7cbf00bd PLB |
116 | .set_bus_conf = cdns_bus_conf, |
117 | .pre_bank_switch = generic_pre_bank_switch, | |
118 | .post_bank_switch = generic_post_bank_switch, | |
119 | .read_ping_status = cdns_read_ping_status, | |
120 | }; | |
121 | ||
122 | /* | |
123 | * probe and init (aux_dev_id argument is required by function prototype but not used) | |
124 | */ | |
125 | static int intel_link_probe(struct auxiliary_device *auxdev, | |
126 | const struct auxiliary_device_id *aux_dev_id) | |
127 | ||
128 | { | |
129 | struct device *dev = &auxdev->dev; | |
130 | struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); | |
131 | struct sdw_intel *sdw; | |
132 | struct sdw_cdns *cdns; | |
133 | struct sdw_bus *bus; | |
134 | int ret; | |
135 | ||
136 | sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL); | |
137 | if (!sdw) | |
138 | return -ENOMEM; | |
139 | ||
140 | cdns = &sdw->cdns; | |
141 | bus = &cdns->bus; | |
142 | ||
143 | sdw->instance = auxdev->id; | |
144 | sdw->link_res = &ldev->link_res; | |
145 | cdns->dev = dev; | |
146 | cdns->registers = sdw->link_res->registers; | |
147 | cdns->instance = sdw->instance; | |
148 | cdns->msg_count = 0; | |
149 | ||
150 | bus->link_id = auxdev->id; | |
151 | bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN; | |
152 | bus->clk_stop_timeout = 1; | |
153 | ||
154 | sdw_cdns_probe(cdns); | |
155 | ||
156 | /* Set ops */ | |
157 | bus->ops = &sdw_intel_ops; | |
158 | ||
159 | /* set driver data, accessed by snd_soc_dai_get_drvdata() */ | |
160 | auxiliary_set_drvdata(auxdev, cdns); | |
161 | ||
162 | /* use generic bandwidth allocation algorithm */ | |
163 | sdw->cdns.bus.compute_params = sdw_compute_params; | |
164 | ||
165 | /* avoid resuming from pm_runtime suspend if it's not required */ | |
166 | dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND); | |
167 | ||
168 | ret = sdw_bus_master_add(bus, dev, dev->fwnode); | |
169 | if (ret) { | |
170 | dev_err(dev, "sdw_bus_master_add fail: %d\n", ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | if (bus->prop.hw_disabled) | |
175 | dev_info(dev, | |
176 | "SoundWire master %d is disabled, will be ignored\n", | |
177 | bus->link_id); | |
178 | /* | |
179 | * Ignore BIOS err_threshold, it's a really bad idea when dealing | |
180 | * with multiple hardware synchronized links | |
181 | */ | |
182 | bus->prop.err_threshold = 0; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | int intel_link_startup(struct auxiliary_device *auxdev) | |
188 | { | |
189 | struct device *dev = &auxdev->dev; | |
190 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); | |
191 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
192 | struct sdw_bus *bus = &cdns->bus; | |
193 | int link_flags; | |
194 | bool multi_link; | |
195 | u32 clock_stop_quirks; | |
196 | int ret; | |
197 | ||
198 | if (bus->prop.hw_disabled) { | |
199 | dev_info(dev, | |
200 | "SoundWire master %d is disabled, ignoring\n", | |
201 | sdw->instance); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | link_flags = md_flags >> (bus->link_id * 8); | |
206 | multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK); | |
207 | if (!multi_link) { | |
208 | dev_dbg(dev, "Multi-link is disabled\n"); | |
209 | } else { | |
210 | /* | |
211 | * hardware-based synchronization is required regardless | |
212 | * of the number of segments used by a stream: SSP-based | |
213 | * synchronization is gated by gsync when the multi-master | |
214 | * mode is set. | |
215 | */ | |
216 | bus->hw_sync_min_links = 1; | |
217 | } | |
218 | bus->multi_link = multi_link; | |
219 | ||
220 | /* Initialize shim, controller */ | |
221 | ret = sdw_intel_link_power_up(sdw); | |
222 | if (ret) | |
223 | goto err_init; | |
224 | ||
225 | /* Register DAIs */ | |
226 | ret = sdw_intel_register_dai(sdw); | |
227 | if (ret) { | |
228 | dev_err(dev, "DAI registration failed: %d\n", ret); | |
229 | goto err_power_up; | |
230 | } | |
231 | ||
232 | sdw_intel_debugfs_init(sdw); | |
233 | ||
234 | /* start bus */ | |
235 | ret = sdw_intel_start_bus(sdw); | |
236 | if (ret) { | |
237 | dev_err(dev, "bus start failed: %d\n", ret); | |
238 | goto err_power_up; | |
239 | } | |
240 | ||
241 | /* Enable runtime PM */ | |
242 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) { | |
243 | pm_runtime_set_autosuspend_delay(dev, | |
244 | INTEL_MASTER_SUSPEND_DELAY_MS); | |
245 | pm_runtime_use_autosuspend(dev); | |
246 | pm_runtime_mark_last_busy(dev); | |
247 | ||
248 | pm_runtime_set_active(dev); | |
249 | pm_runtime_enable(dev); | |
250 | } | |
251 | ||
252 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
253 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) { | |
254 | /* | |
255 | * To keep the clock running we need to prevent | |
256 | * pm_runtime suspend from happening by increasing the | |
257 | * reference count. | |
258 | * This quirk is specified by the parent PCI device in | |
259 | * case of specific latency requirements. It will have | |
260 | * no effect if pm_runtime is disabled by the user via | |
261 | * a module parameter for testing purposes. | |
262 | */ | |
263 | pm_runtime_get_noresume(dev); | |
264 | } | |
265 | ||
266 | /* | |
267 | * The runtime PM status of Slave devices is "Unsupported" | |
268 | * until they report as ATTACHED. If they don't, e.g. because | |
269 | * there are no Slave devices populated or if the power-on is | |
270 | * delayed or dependent on a power switch, the Master will | |
271 | * remain active and prevent its parent from suspending. | |
272 | * | |
273 | * Conditionally force the pm_runtime core to re-evaluate the | |
274 | * Master status in the absence of any Slave activity. A quirk | |
275 | * is provided to e.g. deal with Slaves that may be powered on | |
276 | * with a delay. A more complete solution would require the | |
277 | * definition of Master properties. | |
278 | */ | |
279 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) | |
280 | pm_runtime_idle(dev); | |
281 | ||
282 | sdw->startup_done = true; | |
283 | return 0; | |
284 | ||
285 | err_power_up: | |
286 | sdw_intel_link_power_down(sdw); | |
287 | err_init: | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static void intel_link_remove(struct auxiliary_device *auxdev) | |
292 | { | |
293 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); | |
294 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
295 | struct sdw_bus *bus = &cdns->bus; | |
296 | ||
297 | /* | |
298 | * Since pm_runtime is already disabled, we don't decrease | |
299 | * the refcount when the clock_stop_quirk is | |
300 | * SDW_INTEL_CLK_STOP_NOT_ALLOWED | |
301 | */ | |
302 | if (!bus->prop.hw_disabled) { | |
303 | sdw_intel_debugfs_exit(sdw); | |
304 | sdw_cdns_enable_interrupt(cdns, false); | |
305 | } | |
306 | sdw_bus_master_delete(bus); | |
307 | } | |
308 | ||
309 | int intel_link_process_wakeen_event(struct auxiliary_device *auxdev) | |
310 | { | |
311 | struct device *dev = &auxdev->dev; | |
312 | struct sdw_intel *sdw; | |
313 | struct sdw_bus *bus; | |
314 | ||
315 | sdw = auxiliary_get_drvdata(auxdev); | |
316 | bus = &sdw->cdns.bus; | |
317 | ||
318 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
319 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
320 | bus->link_id); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | if (!sdw_intel_shim_check_wake(sdw)) | |
325 | return 0; | |
326 | ||
327 | /* disable WAKEEN interrupt ASAP to prevent interrupt flood */ | |
328 | sdw_intel_shim_wake(sdw, false); | |
329 | ||
330 | /* | |
331 | * resume the Master, which will generate a bus reset and result in | |
332 | * Slaves re-attaching and be re-enumerated. The SoundWire physical | |
333 | * device which generated the wake will trigger an interrupt, which | |
334 | * will in turn cause the corresponding Linux Slave device to be | |
335 | * resumed and the Slave codec driver to check the status. | |
336 | */ | |
337 | pm_request_resume(dev); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | /* | |
343 | * PM calls | |
344 | */ | |
345 | ||
346 | static int intel_resume_child_device(struct device *dev, void *data) | |
347 | { | |
348 | int ret; | |
349 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
350 | ||
351 | if (!slave->probed) { | |
352 | dev_dbg(dev, "skipping device, no probed driver\n"); | |
353 | return 0; | |
354 | } | |
355 | if (!slave->dev_num_sticky) { | |
356 | dev_dbg(dev, "skipping device, never detected on bus\n"); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | ret = pm_request_resume(dev); | |
361 | if (ret < 0) | |
362 | dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); | |
363 | ||
364 | return ret; | |
365 | } | |
366 | ||
367 | static int __maybe_unused intel_pm_prepare(struct device *dev) | |
368 | { | |
369 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
370 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
371 | struct sdw_bus *bus = &cdns->bus; | |
372 | u32 clock_stop_quirks; | |
373 | int ret; | |
374 | ||
375 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
376 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
377 | bus->link_id); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
382 | ||
383 | if (pm_runtime_suspended(dev) && | |
384 | pm_runtime_suspended(dev->parent) && | |
385 | ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || | |
386 | !clock_stop_quirks)) { | |
387 | /* | |
388 | * if we've enabled clock stop, and the parent is suspended, the SHIM registers | |
389 | * are not accessible and the shim wake cannot be disabled. | |
390 | * The only solution is to resume the entire bus to full power | |
391 | */ | |
392 | ||
393 | /* | |
394 | * If any operation in this block fails, we keep going since we don't want | |
395 | * to prevent system suspend from happening and errors should be recoverable | |
396 | * on resume. | |
397 | */ | |
398 | ||
399 | /* | |
400 | * first resume the device for this link. This will also by construction | |
401 | * resume the PCI parent device. | |
402 | */ | |
403 | ret = pm_request_resume(dev); | |
404 | if (ret < 0) { | |
405 | dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Continue resuming the entire bus (parent + child devices) to exit | |
411 | * the clock stop mode. If there are no devices connected on this link | |
412 | * this is a no-op. | |
413 | * The resume to full power could have been implemented with a .prepare | |
414 | * step in SoundWire codec drivers. This would however require a lot | |
415 | * of code to handle an Intel-specific corner case. It is simpler in | |
416 | * practice to add a loop at the link level. | |
417 | */ | |
418 | ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device); | |
419 | ||
420 | if (ret < 0) | |
421 | dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret); | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | static int __maybe_unused intel_suspend(struct device *dev) | |
428 | { | |
429 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
430 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
431 | struct sdw_bus *bus = &cdns->bus; | |
432 | u32 clock_stop_quirks; | |
433 | int ret; | |
434 | ||
435 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
436 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
437 | bus->link_id); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | if (pm_runtime_suspended(dev)) { | |
442 | dev_dbg(dev, "pm_runtime status: suspended\n"); | |
443 | ||
444 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
445 | ||
446 | if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || | |
447 | !clock_stop_quirks) { | |
448 | ||
449 | if (pm_runtime_suspended(dev->parent)) { | |
450 | /* | |
451 | * paranoia check: this should not happen with the .prepare | |
452 | * resume to full power | |
453 | */ | |
454 | dev_err(dev, "%s: invalid config: parent is suspended\n", __func__); | |
455 | } else { | |
456 | sdw_intel_shim_wake(sdw, false); | |
457 | } | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | ret = sdw_intel_stop_bus(sdw, false); | |
464 | if (ret < 0) { | |
465 | dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret); | |
466 | return ret; | |
467 | } | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | static int __maybe_unused intel_suspend_runtime(struct device *dev) | |
473 | { | |
474 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
475 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
476 | struct sdw_bus *bus = &cdns->bus; | |
477 | u32 clock_stop_quirks; | |
478 | int ret; | |
479 | ||
480 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
481 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
482 | bus->link_id); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
487 | ||
488 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { | |
489 | ret = sdw_intel_stop_bus(sdw, false); | |
490 | if (ret < 0) { | |
491 | dev_err(dev, "%s: cannot stop bus during teardown: %d\n", | |
492 | __func__, ret); | |
493 | return ret; | |
494 | } | |
495 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) { | |
496 | ret = sdw_intel_stop_bus(sdw, true); | |
497 | if (ret < 0) { | |
498 | dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n", | |
499 | __func__, ret); | |
500 | return ret; | |
501 | } | |
502 | } else { | |
503 | dev_err(dev, "%s clock_stop_quirks %x unsupported\n", | |
504 | __func__, clock_stop_quirks); | |
505 | ret = -EINVAL; | |
506 | } | |
507 | ||
508 | return ret; | |
509 | } | |
510 | ||
511 | static int __maybe_unused intel_resume(struct device *dev) | |
512 | { | |
513 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
514 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
515 | struct sdw_bus *bus = &cdns->bus; | |
516 | int link_flags; | |
517 | int ret; | |
518 | ||
519 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
520 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
521 | bus->link_id); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | link_flags = md_flags >> (bus->link_id * 8); | |
526 | ||
527 | if (pm_runtime_suspended(dev)) { | |
528 | dev_dbg(dev, "pm_runtime status was suspended, forcing active\n"); | |
529 | ||
530 | /* follow required sequence from runtime_pm.rst */ | |
531 | pm_runtime_disable(dev); | |
532 | pm_runtime_set_active(dev); | |
533 | pm_runtime_mark_last_busy(dev); | |
534 | pm_runtime_enable(dev); | |
535 | ||
536 | link_flags = md_flags >> (bus->link_id * 8); | |
537 | ||
538 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) | |
539 | pm_runtime_idle(dev); | |
540 | } | |
541 | ||
542 | ret = sdw_intel_link_power_up(sdw); | |
543 | if (ret) { | |
544 | dev_err(dev, "%s failed: %d\n", __func__, ret); | |
545 | return ret; | |
546 | } | |
547 | ||
548 | /* | |
549 | * make sure all Slaves are tagged as UNATTACHED and provide | |
550 | * reason for reinitialization | |
551 | */ | |
552 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); | |
553 | ||
554 | ret = sdw_intel_start_bus(sdw); | |
555 | if (ret < 0) { | |
556 | dev_err(dev, "cannot start bus during resume\n"); | |
557 | sdw_intel_link_power_down(sdw); | |
558 | return ret; | |
559 | } | |
560 | ||
561 | /* | |
562 | * after system resume, the pm_runtime suspend() may kick in | |
563 | * during the enumeration, before any children device force the | |
564 | * master device to remain active. Using pm_runtime_get() | |
565 | * routines is not really possible, since it'd prevent the | |
566 | * master from suspending. | |
567 | * A reasonable compromise is to update the pm_runtime | |
568 | * counters and delay the pm_runtime suspend by several | |
569 | * seconds, by when all enumeration should be complete. | |
570 | */ | |
571 | pm_runtime_mark_last_busy(dev); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | static int __maybe_unused intel_resume_runtime(struct device *dev) | |
577 | { | |
578 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
579 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
580 | struct sdw_bus *bus = &cdns->bus; | |
581 | u32 clock_stop_quirks; | |
582 | int ret; | |
583 | ||
584 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
585 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
586 | bus->link_id); | |
587 | return 0; | |
588 | } | |
589 | ||
590 | /* unconditionally disable WAKEEN interrupt */ | |
591 | sdw_intel_shim_wake(sdw, false); | |
592 | ||
593 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
594 | ||
595 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { | |
596 | ret = sdw_intel_link_power_up(sdw); | |
597 | if (ret) { | |
598 | dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | /* | |
603 | * make sure all Slaves are tagged as UNATTACHED and provide | |
604 | * reason for reinitialization | |
605 | */ | |
606 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); | |
607 | ||
608 | ret = sdw_intel_start_bus(sdw); | |
609 | if (ret < 0) { | |
610 | dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret); | |
611 | sdw_intel_link_power_down(sdw); | |
612 | return ret; | |
613 | } | |
614 | ||
615 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { | |
616 | ret = sdw_intel_link_power_up(sdw); | |
617 | if (ret) { | |
618 | dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret); | |
619 | return ret; | |
620 | } | |
621 | ||
622 | ret = sdw_intel_start_bus_after_reset(sdw); | |
623 | if (ret < 0) { | |
624 | dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret); | |
625 | sdw_intel_link_power_down(sdw); | |
626 | return ret; | |
627 | } | |
628 | } else if (!clock_stop_quirks) { | |
629 | ||
630 | sdw_intel_check_clock_stop(sdw); | |
631 | ||
632 | ret = sdw_intel_link_power_up(sdw); | |
633 | if (ret) { | |
634 | dev_err(dev, "%s: power_up failed: %d\n", __func__, ret); | |
635 | return ret; | |
636 | } | |
637 | ||
638 | ret = sdw_intel_start_bus_after_clock_stop(sdw); | |
639 | if (ret < 0) { | |
640 | dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret); | |
641 | sdw_intel_link_power_down(sdw); | |
642 | return ret; | |
643 | } | |
644 | } else { | |
645 | dev_err(dev, "%s: clock_stop_quirks %x unsupported\n", | |
646 | __func__, clock_stop_quirks); | |
647 | ret = -EINVAL; | |
648 | } | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
653 | static const struct dev_pm_ops intel_pm = { | |
654 | .prepare = intel_pm_prepare, | |
655 | SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) | |
656 | SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL) | |
657 | }; | |
658 | ||
659 | static const struct auxiliary_device_id intel_link_id_table[] = { | |
660 | { .name = "soundwire_intel.link" }, | |
661 | {}, | |
662 | }; | |
663 | MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table); | |
664 | ||
665 | static struct auxiliary_driver sdw_intel_drv = { | |
666 | .probe = intel_link_probe, | |
667 | .remove = intel_link_remove, | |
668 | .driver = { | |
669 | /* auxiliary_driver_register() sets .name to be the modname */ | |
670 | .pm = &intel_pm, | |
671 | }, | |
672 | .id_table = intel_link_id_table | |
673 | }; | |
674 | module_auxiliary_driver(sdw_intel_drv); | |
675 | ||
676 | MODULE_LICENSE("Dual BSD/GPL"); | |
677 | MODULE_DESCRIPTION("Intel Soundwire Link Driver"); |