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7cbf00bd PLB |
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 | ||
7cbf00bd PLB |
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 | ||
e66f91a2 PLB |
44 | struct wake_capable_part { |
45 | const u16 mfg_id; | |
46 | const u16 part_id; | |
47 | }; | |
48 | ||
49 | static struct wake_capable_part wake_capable_list[] = { | |
50 | {0x025d, 0x5682}, | |
51 | {0x025d, 0x700}, | |
52 | {0x025d, 0x711}, | |
53 | {0x025d, 0x1712}, | |
54 | {0x025d, 0x1713}, | |
55 | {0x025d, 0x1716}, | |
56 | {0x025d, 0x1717}, | |
57 | {0x025d, 0x712}, | |
58 | {0x025d, 0x713}, | |
59 | {0x025d, 0x714}, | |
60 | {0x025d, 0x715}, | |
61 | {0x025d, 0x716}, | |
62 | {0x025d, 0x717}, | |
63 | {0x025d, 0x722}, | |
64 | }; | |
65 | ||
66 | static bool is_wake_capable(struct sdw_slave *slave) | |
67 | { | |
68 | int i; | |
69 | ||
70 | for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++) | |
71 | if (slave->id.part_id == wake_capable_list[i].part_id && | |
72 | slave->id.mfg_id == wake_capable_list[i].mfg_id) | |
73 | return true; | |
74 | return false; | |
75 | } | |
76 | ||
7cbf00bd PLB |
77 | static int generic_pre_bank_switch(struct sdw_bus *bus) |
78 | { | |
79 | struct sdw_cdns *cdns = bus_to_cdns(bus); | |
80 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
81 | ||
82 | return sdw->link_res->hw_ops->pre_bank_switch(sdw); | |
83 | } | |
84 | ||
85 | static int generic_post_bank_switch(struct sdw_bus *bus) | |
86 | { | |
87 | struct sdw_cdns *cdns = bus_to_cdns(bus); | |
88 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
89 | ||
90 | return sdw->link_res->hw_ops->post_bank_switch(sdw); | |
91 | } | |
92 | ||
23afc82f PLB |
93 | static void generic_new_peripheral_assigned(struct sdw_bus *bus, |
94 | struct sdw_slave *slave, | |
95 | int dev_num) | |
bcf71917 PLB |
96 | { |
97 | struct sdw_cdns *cdns = bus_to_cdns(bus); | |
98 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
e66f91a2 PLB |
99 | int dev_num_min; |
100 | int dev_num_max; | |
101 | bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave); | |
102 | ||
103 | if (wake_capable) { | |
104 | dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN; | |
105 | dev_num_max = SDW_MAX_DEVICES; | |
106 | } else { | |
107 | dev_num_min = 1; | |
108 | dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1; | |
109 | } | |
bcf71917 PLB |
110 | |
111 | /* paranoia check, this should never happen */ | |
e66f91a2 PLB |
112 | if (dev_num < dev_num_min || dev_num > dev_num_max) { |
113 | dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n", | |
114 | __func__, dev_num, slave->prop.wake_capable); | |
bcf71917 PLB |
115 | return; |
116 | } | |
117 | ||
e66f91a2 | 118 | if (sdw->link_res->hw_ops->program_sdi && wake_capable) |
bcf71917 PLB |
119 | sdw->link_res->hw_ops->program_sdi(sdw, dev_num); |
120 | } | |
121 | ||
7cbf00bd PLB |
122 | static int sdw_master_read_intel_prop(struct sdw_bus *bus) |
123 | { | |
124 | struct sdw_master_prop *prop = &bus->prop; | |
3b0b441a | 125 | struct sdw_intel_prop *intel_prop; |
7cbf00bd PLB |
126 | struct fwnode_handle *link; |
127 | char name[32]; | |
128 | u32 quirk_mask; | |
129 | ||
130 | /* Find master handle */ | |
131 | snprintf(name, sizeof(name), | |
132 | "mipi-sdw-link-%d-subproperties", bus->link_id); | |
133 | ||
134 | link = device_get_named_child_node(bus->dev, name); | |
135 | if (!link) { | |
136 | dev_err(bus->dev, "Master node %s not found\n", name); | |
137 | return -EIO; | |
138 | } | |
139 | ||
140 | fwnode_property_read_u32(link, | |
141 | "intel-sdw-ip-clock", | |
142 | &prop->mclk_freq); | |
143 | ||
144 | /* the values reported by BIOS are the 2x clock, not the bus clock */ | |
145 | prop->mclk_freq /= 2; | |
146 | ||
147 | fwnode_property_read_u32(link, | |
148 | "intel-quirk-mask", | |
149 | &quirk_mask); | |
150 | ||
151 | if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) | |
152 | prop->hw_disabled = true; | |
153 | ||
154 | prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH | | |
155 | SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY; | |
156 | ||
3b0b441a PLB |
157 | intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL); |
158 | if (!intel_prop) | |
159 | return -ENOMEM; | |
160 | ||
161 | /* initialize with hardware defaults, in case the properties are not found */ | |
a0df7e04 | 162 | intel_prop->doaise = 0x1; |
3b0b441a | 163 | intel_prop->doais = 0x3; |
75933ba5 | 164 | intel_prop->dodse = 0x0; |
3b0b441a PLB |
165 | intel_prop->dods = 0x1; |
166 | ||
a0df7e04 PLB |
167 | fwnode_property_read_u16(link, |
168 | "intel-sdw-doaise", | |
169 | &intel_prop->doaise); | |
3b0b441a PLB |
170 | fwnode_property_read_u16(link, |
171 | "intel-sdw-doais", | |
172 | &intel_prop->doais); | |
75933ba5 PLB |
173 | fwnode_property_read_u16(link, |
174 | "intel-sdw-dodse", | |
175 | &intel_prop->dodse); | |
3b0b441a PLB |
176 | fwnode_property_read_u16(link, |
177 | "intel-sdw-dods", | |
178 | &intel_prop->dods); | |
179 | bus->vendor_specific_prop = intel_prop; | |
180 | ||
a0df7e04 PLB |
181 | dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n", |
182 | intel_prop->doaise, | |
3b0b441a | 183 | intel_prop->doais, |
75933ba5 | 184 | intel_prop->dodse, |
3b0b441a PLB |
185 | intel_prop->dods); |
186 | ||
7cbf00bd PLB |
187 | return 0; |
188 | } | |
189 | ||
190 | static int intel_prop_read(struct sdw_bus *bus) | |
191 | { | |
192 | /* Initialize with default handler to read all DisCo properties */ | |
193 | sdw_master_read_prop(bus); | |
194 | ||
195 | /* read Intel-specific properties */ | |
196 | sdw_master_read_intel_prop(bus); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
39d80b0e PLB |
201 | static DEFINE_IDA(intel_peripheral_ida); |
202 | ||
203 | static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave) | |
204 | { | |
e66f91a2 PLB |
205 | int bit; |
206 | ||
207 | if (slave->prop.wake_capable || is_wake_capable(slave)) | |
208 | return ida_alloc_range(&intel_peripheral_ida, | |
209 | SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES, | |
210 | GFP_KERNEL); | |
211 | ||
212 | bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES); | |
213 | if (bit == SDW_MAX_DEVICES) | |
214 | return -ENODEV; | |
215 | ||
216 | return bit; | |
39d80b0e PLB |
217 | } |
218 | ||
219 | static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave) | |
220 | { | |
e66f91a2 PLB |
221 | if (slave->prop.wake_capable || is_wake_capable(slave)) |
222 | ida_free(&intel_peripheral_ida, slave->dev_num); | |
39d80b0e PLB |
223 | } |
224 | ||
7cbf00bd PLB |
225 | static struct sdw_master_ops sdw_intel_ops = { |
226 | .read_prop = intel_prop_read, | |
227 | .override_adr = sdw_dmi_override_adr, | |
228 | .xfer_msg = cdns_xfer_msg, | |
229 | .xfer_msg_defer = cdns_xfer_msg_defer, | |
7cbf00bd PLB |
230 | .set_bus_conf = cdns_bus_conf, |
231 | .pre_bank_switch = generic_pre_bank_switch, | |
232 | .post_bank_switch = generic_post_bank_switch, | |
233 | .read_ping_status = cdns_read_ping_status, | |
39d80b0e PLB |
234 | .get_device_num = intel_get_device_num_ida, |
235 | .put_device_num = intel_put_device_num_ida, | |
bcf71917 | 236 | .new_peripheral_assigned = generic_new_peripheral_assigned, |
7cbf00bd PLB |
237 | }; |
238 | ||
239 | /* | |
240 | * probe and init (aux_dev_id argument is required by function prototype but not used) | |
241 | */ | |
242 | static int intel_link_probe(struct auxiliary_device *auxdev, | |
243 | const struct auxiliary_device_id *aux_dev_id) | |
244 | ||
245 | { | |
246 | struct device *dev = &auxdev->dev; | |
247 | struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); | |
248 | struct sdw_intel *sdw; | |
249 | struct sdw_cdns *cdns; | |
250 | struct sdw_bus *bus; | |
251 | int ret; | |
252 | ||
253 | sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL); | |
254 | if (!sdw) | |
255 | return -ENOMEM; | |
256 | ||
257 | cdns = &sdw->cdns; | |
258 | bus = &cdns->bus; | |
259 | ||
260 | sdw->instance = auxdev->id; | |
261 | sdw->link_res = &ldev->link_res; | |
262 | cdns->dev = dev; | |
263 | cdns->registers = sdw->link_res->registers; | |
e40e0e11 | 264 | cdns->ip_offset = sdw->link_res->ip_offset; |
7cbf00bd PLB |
265 | cdns->instance = sdw->instance; |
266 | cdns->msg_count = 0; | |
267 | ||
6543ac13 PLB |
268 | /* single controller for all SoundWire links */ |
269 | bus->controller_id = 0; | |
270 | ||
7cbf00bd | 271 | bus->link_id = auxdev->id; |
7cbf00bd PLB |
272 | bus->clk_stop_timeout = 1; |
273 | ||
274 | sdw_cdns_probe(cdns); | |
275 | ||
276 | /* Set ops */ | |
277 | bus->ops = &sdw_intel_ops; | |
278 | ||
279 | /* set driver data, accessed by snd_soc_dai_get_drvdata() */ | |
280 | auxiliary_set_drvdata(auxdev, cdns); | |
281 | ||
282 | /* use generic bandwidth allocation algorithm */ | |
283 | sdw->cdns.bus.compute_params = sdw_compute_params; | |
284 | ||
285 | /* avoid resuming from pm_runtime suspend if it's not required */ | |
286 | dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND); | |
287 | ||
288 | ret = sdw_bus_master_add(bus, dev, dev->fwnode); | |
289 | if (ret) { | |
290 | dev_err(dev, "sdw_bus_master_add fail: %d\n", ret); | |
291 | return ret; | |
292 | } | |
293 | ||
294 | if (bus->prop.hw_disabled) | |
295 | dev_info(dev, | |
296 | "SoundWire master %d is disabled, will be ignored\n", | |
297 | bus->link_id); | |
298 | /* | |
299 | * Ignore BIOS err_threshold, it's a really bad idea when dealing | |
300 | * with multiple hardware synchronized links | |
301 | */ | |
302 | bus->prop.err_threshold = 0; | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | int intel_link_startup(struct auxiliary_device *auxdev) | |
308 | { | |
309 | struct device *dev = &auxdev->dev; | |
310 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); | |
311 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
312 | struct sdw_bus *bus = &cdns->bus; | |
313 | int link_flags; | |
314 | bool multi_link; | |
315 | u32 clock_stop_quirks; | |
316 | int ret; | |
317 | ||
318 | if (bus->prop.hw_disabled) { | |
319 | dev_info(dev, | |
320 | "SoundWire master %d is disabled, ignoring\n", | |
321 | sdw->instance); | |
322 | return 0; | |
323 | } | |
324 | ||
325 | link_flags = md_flags >> (bus->link_id * 8); | |
326 | multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK); | |
327 | if (!multi_link) { | |
328 | dev_dbg(dev, "Multi-link is disabled\n"); | |
329 | } else { | |
330 | /* | |
331 | * hardware-based synchronization is required regardless | |
332 | * of the number of segments used by a stream: SSP-based | |
333 | * synchronization is gated by gsync when the multi-master | |
334 | * mode is set. | |
335 | */ | |
336 | bus->hw_sync_min_links = 1; | |
337 | } | |
338 | bus->multi_link = multi_link; | |
339 | ||
340 | /* Initialize shim, controller */ | |
341 | ret = sdw_intel_link_power_up(sdw); | |
342 | if (ret) | |
343 | goto err_init; | |
344 | ||
345 | /* Register DAIs */ | |
346 | ret = sdw_intel_register_dai(sdw); | |
347 | if (ret) { | |
348 | dev_err(dev, "DAI registration failed: %d\n", ret); | |
349 | goto err_power_up; | |
350 | } | |
351 | ||
352 | sdw_intel_debugfs_init(sdw); | |
353 | ||
7cbf00bd PLB |
354 | /* Enable runtime PM */ |
355 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) { | |
356 | pm_runtime_set_autosuspend_delay(dev, | |
357 | INTEL_MASTER_SUSPEND_DELAY_MS); | |
358 | pm_runtime_use_autosuspend(dev); | |
359 | pm_runtime_mark_last_busy(dev); | |
360 | ||
361 | pm_runtime_set_active(dev); | |
362 | pm_runtime_enable(dev); | |
f9031288 PLB |
363 | |
364 | pm_runtime_resume(bus->dev); | |
7cbf00bd PLB |
365 | } |
366 | ||
3d71f43f PLB |
367 | /* start bus */ |
368 | ret = sdw_intel_start_bus(sdw); | |
369 | if (ret) { | |
370 | dev_err(dev, "bus start failed: %d\n", ret); | |
371 | goto err_pm_runtime; | |
372 | } | |
373 | ||
7cbf00bd PLB |
374 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; |
375 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) { | |
376 | /* | |
377 | * To keep the clock running we need to prevent | |
378 | * pm_runtime suspend from happening by increasing the | |
379 | * reference count. | |
380 | * This quirk is specified by the parent PCI device in | |
381 | * case of specific latency requirements. It will have | |
382 | * no effect if pm_runtime is disabled by the user via | |
383 | * a module parameter for testing purposes. | |
384 | */ | |
385 | pm_runtime_get_noresume(dev); | |
386 | } | |
387 | ||
388 | /* | |
389 | * The runtime PM status of Slave devices is "Unsupported" | |
390 | * until they report as ATTACHED. If they don't, e.g. because | |
391 | * there are no Slave devices populated or if the power-on is | |
392 | * delayed or dependent on a power switch, the Master will | |
393 | * remain active and prevent its parent from suspending. | |
394 | * | |
395 | * Conditionally force the pm_runtime core to re-evaluate the | |
396 | * Master status in the absence of any Slave activity. A quirk | |
397 | * is provided to e.g. deal with Slaves that may be powered on | |
398 | * with a delay. A more complete solution would require the | |
399 | * definition of Master properties. | |
400 | */ | |
3d71f43f | 401 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) { |
f9031288 | 402 | pm_runtime_mark_last_busy(bus->dev); |
3d71f43f | 403 | pm_runtime_mark_last_busy(dev); |
7cbf00bd | 404 | pm_runtime_idle(dev); |
3d71f43f | 405 | } |
7cbf00bd PLB |
406 | |
407 | sdw->startup_done = true; | |
408 | return 0; | |
409 | ||
3d71f43f PLB |
410 | err_pm_runtime: |
411 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) | |
412 | pm_runtime_disable(dev); | |
7cbf00bd PLB |
413 | err_power_up: |
414 | sdw_intel_link_power_down(sdw); | |
415 | err_init: | |
416 | return ret; | |
417 | } | |
418 | ||
419 | static void intel_link_remove(struct auxiliary_device *auxdev) | |
420 | { | |
421 | struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); | |
422 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
423 | struct sdw_bus *bus = &cdns->bus; | |
424 | ||
425 | /* | |
426 | * Since pm_runtime is already disabled, we don't decrease | |
427 | * the refcount when the clock_stop_quirk is | |
428 | * SDW_INTEL_CLK_STOP_NOT_ALLOWED | |
429 | */ | |
430 | if (!bus->prop.hw_disabled) { | |
431 | sdw_intel_debugfs_exit(sdw); | |
432 | sdw_cdns_enable_interrupt(cdns, false); | |
433 | } | |
434 | sdw_bus_master_delete(bus); | |
435 | } | |
436 | ||
437 | int intel_link_process_wakeen_event(struct auxiliary_device *auxdev) | |
438 | { | |
439 | struct device *dev = &auxdev->dev; | |
440 | struct sdw_intel *sdw; | |
441 | struct sdw_bus *bus; | |
442 | ||
443 | sdw = auxiliary_get_drvdata(auxdev); | |
444 | bus = &sdw->cdns.bus; | |
445 | ||
446 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
447 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
448 | bus->link_id); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | if (!sdw_intel_shim_check_wake(sdw)) | |
453 | return 0; | |
454 | ||
455 | /* disable WAKEEN interrupt ASAP to prevent interrupt flood */ | |
456 | sdw_intel_shim_wake(sdw, false); | |
457 | ||
458 | /* | |
459 | * resume the Master, which will generate a bus reset and result in | |
460 | * Slaves re-attaching and be re-enumerated. The SoundWire physical | |
461 | * device which generated the wake will trigger an interrupt, which | |
462 | * will in turn cause the corresponding Linux Slave device to be | |
463 | * resumed and the Slave codec driver to check the status. | |
464 | */ | |
465 | pm_request_resume(dev); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | /* | |
471 | * PM calls | |
472 | */ | |
473 | ||
f2fa6865 | 474 | int intel_resume_child_device(struct device *dev, void *data) |
7cbf00bd PLB |
475 | { |
476 | int ret; | |
477 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
478 | ||
479 | if (!slave->probed) { | |
480 | dev_dbg(dev, "skipping device, no probed driver\n"); | |
481 | return 0; | |
482 | } | |
483 | if (!slave->dev_num_sticky) { | |
484 | dev_dbg(dev, "skipping device, never detected on bus\n"); | |
485 | return 0; | |
486 | } | |
487 | ||
6f4867fa | 488 | ret = pm_runtime_resume(dev); |
67572c8d | 489 | if (ret < 0) { |
6f4867fa | 490 | dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret); |
67572c8d PLB |
491 | return ret; |
492 | } | |
7cbf00bd | 493 | |
67572c8d | 494 | return 0; |
7cbf00bd PLB |
495 | } |
496 | ||
497 | static int __maybe_unused intel_pm_prepare(struct device *dev) | |
498 | { | |
499 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
500 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
501 | struct sdw_bus *bus = &cdns->bus; | |
502 | u32 clock_stop_quirks; | |
503 | int ret; | |
504 | ||
505 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
506 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
507 | bus->link_id); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
512 | ||
513 | if (pm_runtime_suspended(dev) && | |
514 | pm_runtime_suspended(dev->parent) && | |
515 | ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || | |
516 | !clock_stop_quirks)) { | |
517 | /* | |
518 | * if we've enabled clock stop, and the parent is suspended, the SHIM registers | |
519 | * are not accessible and the shim wake cannot be disabled. | |
520 | * The only solution is to resume the entire bus to full power | |
521 | */ | |
522 | ||
523 | /* | |
524 | * If any operation in this block fails, we keep going since we don't want | |
525 | * to prevent system suspend from happening and errors should be recoverable | |
526 | * on resume. | |
527 | */ | |
528 | ||
529 | /* | |
530 | * first resume the device for this link. This will also by construction | |
531 | * resume the PCI parent device. | |
532 | */ | |
6f4867fa | 533 | ret = pm_runtime_resume(dev); |
7cbf00bd | 534 | if (ret < 0) { |
6f4867fa | 535 | dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret); |
7cbf00bd PLB |
536 | return 0; |
537 | } | |
538 | ||
539 | /* | |
540 | * Continue resuming the entire bus (parent + child devices) to exit | |
541 | * the clock stop mode. If there are no devices connected on this link | |
542 | * this is a no-op. | |
543 | * The resume to full power could have been implemented with a .prepare | |
544 | * step in SoundWire codec drivers. This would however require a lot | |
545 | * of code to handle an Intel-specific corner case. It is simpler in | |
546 | * practice to add a loop at the link level. | |
547 | */ | |
548 | ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device); | |
549 | ||
550 | if (ret < 0) | |
551 | dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret); | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static int __maybe_unused intel_suspend(struct device *dev) | |
558 | { | |
559 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
560 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
561 | struct sdw_bus *bus = &cdns->bus; | |
562 | u32 clock_stop_quirks; | |
563 | int ret; | |
564 | ||
565 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
566 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
567 | bus->link_id); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | if (pm_runtime_suspended(dev)) { | |
572 | dev_dbg(dev, "pm_runtime status: suspended\n"); | |
573 | ||
574 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
575 | ||
576 | if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || | |
577 | !clock_stop_quirks) { | |
578 | ||
579 | if (pm_runtime_suspended(dev->parent)) { | |
580 | /* | |
581 | * paranoia check: this should not happen with the .prepare | |
582 | * resume to full power | |
583 | */ | |
584 | dev_err(dev, "%s: invalid config: parent is suspended\n", __func__); | |
585 | } else { | |
586 | sdw_intel_shim_wake(sdw, false); | |
587 | } | |
588 | } | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | ret = sdw_intel_stop_bus(sdw, false); | |
594 | if (ret < 0) { | |
595 | dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | static int __maybe_unused intel_suspend_runtime(struct device *dev) | |
603 | { | |
604 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
605 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
606 | struct sdw_bus *bus = &cdns->bus; | |
607 | u32 clock_stop_quirks; | |
608 | int ret; | |
609 | ||
610 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
611 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
612 | bus->link_id); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
617 | ||
618 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { | |
619 | ret = sdw_intel_stop_bus(sdw, false); | |
620 | if (ret < 0) { | |
621 | dev_err(dev, "%s: cannot stop bus during teardown: %d\n", | |
622 | __func__, ret); | |
623 | return ret; | |
624 | } | |
625 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) { | |
626 | ret = sdw_intel_stop_bus(sdw, true); | |
627 | if (ret < 0) { | |
628 | dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n", | |
629 | __func__, ret); | |
630 | return ret; | |
631 | } | |
632 | } else { | |
633 | dev_err(dev, "%s clock_stop_quirks %x unsupported\n", | |
634 | __func__, clock_stop_quirks); | |
635 | ret = -EINVAL; | |
636 | } | |
637 | ||
638 | return ret; | |
639 | } | |
640 | ||
641 | static int __maybe_unused intel_resume(struct device *dev) | |
642 | { | |
643 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
644 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
645 | struct sdw_bus *bus = &cdns->bus; | |
646 | int link_flags; | |
647 | int ret; | |
648 | ||
649 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
650 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
651 | bus->link_id); | |
652 | return 0; | |
653 | } | |
654 | ||
7cbf00bd PLB |
655 | if (pm_runtime_suspended(dev)) { |
656 | dev_dbg(dev, "pm_runtime status was suspended, forcing active\n"); | |
657 | ||
658 | /* follow required sequence from runtime_pm.rst */ | |
659 | pm_runtime_disable(dev); | |
660 | pm_runtime_set_active(dev); | |
661 | pm_runtime_mark_last_busy(dev); | |
662 | pm_runtime_enable(dev); | |
663 | ||
f9031288 PLB |
664 | pm_runtime_resume(bus->dev); |
665 | ||
7cbf00bd PLB |
666 | link_flags = md_flags >> (bus->link_id * 8); |
667 | ||
668 | if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) | |
669 | pm_runtime_idle(dev); | |
670 | } | |
671 | ||
672 | ret = sdw_intel_link_power_up(sdw); | |
673 | if (ret) { | |
674 | dev_err(dev, "%s failed: %d\n", __func__, ret); | |
675 | return ret; | |
676 | } | |
677 | ||
678 | /* | |
679 | * make sure all Slaves are tagged as UNATTACHED and provide | |
680 | * reason for reinitialization | |
681 | */ | |
682 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); | |
683 | ||
684 | ret = sdw_intel_start_bus(sdw); | |
685 | if (ret < 0) { | |
686 | dev_err(dev, "cannot start bus during resume\n"); | |
687 | sdw_intel_link_power_down(sdw); | |
688 | return ret; | |
689 | } | |
690 | ||
691 | /* | |
692 | * after system resume, the pm_runtime suspend() may kick in | |
693 | * during the enumeration, before any children device force the | |
694 | * master device to remain active. Using pm_runtime_get() | |
695 | * routines is not really possible, since it'd prevent the | |
696 | * master from suspending. | |
697 | * A reasonable compromise is to update the pm_runtime | |
698 | * counters and delay the pm_runtime suspend by several | |
699 | * seconds, by when all enumeration should be complete. | |
700 | */ | |
f9031288 | 701 | pm_runtime_mark_last_busy(bus->dev); |
7cbf00bd PLB |
702 | pm_runtime_mark_last_busy(dev); |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | static int __maybe_unused intel_resume_runtime(struct device *dev) | |
708 | { | |
709 | struct sdw_cdns *cdns = dev_get_drvdata(dev); | |
710 | struct sdw_intel *sdw = cdns_to_intel(cdns); | |
711 | struct sdw_bus *bus = &cdns->bus; | |
712 | u32 clock_stop_quirks; | |
713 | int ret; | |
714 | ||
715 | if (bus->prop.hw_disabled || !sdw->startup_done) { | |
716 | dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", | |
717 | bus->link_id); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* unconditionally disable WAKEEN interrupt */ | |
722 | sdw_intel_shim_wake(sdw, false); | |
723 | ||
724 | clock_stop_quirks = sdw->link_res->clock_stop_quirks; | |
725 | ||
726 | if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { | |
727 | ret = sdw_intel_link_power_up(sdw); | |
728 | if (ret) { | |
729 | dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret); | |
730 | return ret; | |
731 | } | |
732 | ||
733 | /* | |
734 | * make sure all Slaves are tagged as UNATTACHED and provide | |
735 | * reason for reinitialization | |
736 | */ | |
737 | sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); | |
738 | ||
739 | ret = sdw_intel_start_bus(sdw); | |
740 | if (ret < 0) { | |
741 | dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret); | |
742 | sdw_intel_link_power_down(sdw); | |
743 | return ret; | |
744 | } | |
745 | ||
746 | } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { | |
747 | ret = sdw_intel_link_power_up(sdw); | |
748 | if (ret) { | |
749 | dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret); | |
750 | return ret; | |
751 | } | |
752 | ||
753 | ret = sdw_intel_start_bus_after_reset(sdw); | |
754 | if (ret < 0) { | |
755 | dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret); | |
756 | sdw_intel_link_power_down(sdw); | |
757 | return ret; | |
758 | } | |
759 | } else if (!clock_stop_quirks) { | |
760 | ||
761 | sdw_intel_check_clock_stop(sdw); | |
762 | ||
763 | ret = sdw_intel_link_power_up(sdw); | |
764 | if (ret) { | |
765 | dev_err(dev, "%s: power_up failed: %d\n", __func__, ret); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | ret = sdw_intel_start_bus_after_clock_stop(sdw); | |
770 | if (ret < 0) { | |
771 | dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret); | |
772 | sdw_intel_link_power_down(sdw); | |
773 | return ret; | |
774 | } | |
775 | } else { | |
776 | dev_err(dev, "%s: clock_stop_quirks %x unsupported\n", | |
777 | __func__, clock_stop_quirks); | |
778 | ret = -EINVAL; | |
779 | } | |
780 | ||
781 | return ret; | |
782 | } | |
783 | ||
784 | static const struct dev_pm_ops intel_pm = { | |
785 | .prepare = intel_pm_prepare, | |
786 | SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) | |
787 | SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL) | |
788 | }; | |
789 | ||
790 | static const struct auxiliary_device_id intel_link_id_table[] = { | |
791 | { .name = "soundwire_intel.link" }, | |
792 | {}, | |
793 | }; | |
794 | MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table); | |
795 | ||
796 | static struct auxiliary_driver sdw_intel_drv = { | |
797 | .probe = intel_link_probe, | |
798 | .remove = intel_link_remove, | |
799 | .driver = { | |
800 | /* auxiliary_driver_register() sets .name to be the modname */ | |
801 | .pm = &intel_pm, | |
802 | }, | |
803 | .id_table = intel_link_id_table | |
804 | }; | |
805 | module_auxiliary_driver(sdw_intel_drv); | |
806 | ||
807 | MODULE_LICENSE("Dual BSD/GPL"); | |
808 | MODULE_DESCRIPTION("Intel Soundwire Link Driver"); |