1 /*
2 * Copyright (c) 2014,2017 Qualcomm Atheros, Inc.
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "wil6210.h"
19 #include <linux/jiffies.h>
20 #include <linux/pm_runtime.h>
21
22 #define WIL6210_AUTOSUSPEND_DELAY_MS (1000)
23
wil_pm_wake_connected_net_queues(struct wil6210_priv * wil)24 static void wil_pm_wake_connected_net_queues(struct wil6210_priv *wil)
25 {
26 int i;
27
28 mutex_lock(&wil->vif_mutex);
29 for (i = 0; i < wil->max_vifs; i++) {
30 struct wil6210_vif *vif = wil->vifs[i];
31
32 if (vif && test_bit(wil_vif_fwconnected, vif->status))
33 wil_update_net_queues_bh(wil, vif, NULL, false);
34 }
35 mutex_unlock(&wil->vif_mutex);
36 }
37
wil_pm_stop_all_net_queues(struct wil6210_priv * wil)38 static void wil_pm_stop_all_net_queues(struct wil6210_priv *wil)
39 {
40 int i;
41
42 mutex_lock(&wil->vif_mutex);
43 for (i = 0; i < wil->max_vifs; i++) {
44 struct wil6210_vif *vif = wil->vifs[i];
45
46 if (vif)
47 wil_update_net_queues_bh(wil, vif, NULL, true);
48 }
49 mutex_unlock(&wil->vif_mutex);
50 }
51
52 static bool
wil_can_suspend_vif(struct wil6210_priv * wil,struct wil6210_vif * vif,bool is_runtime)53 wil_can_suspend_vif(struct wil6210_priv *wil, struct wil6210_vif *vif,
54 bool is_runtime)
55 {
56 struct wireless_dev *wdev = vif_to_wdev(vif);
57
58 switch (wdev->iftype) {
59 case NL80211_IFTYPE_MONITOR:
60 wil_dbg_pm(wil, "Sniffer\n");
61 return false;
62
63 /* for STA-like interface, don't runtime suspend */
64 case NL80211_IFTYPE_STATION:
65 case NL80211_IFTYPE_P2P_CLIENT:
66 if (test_bit(wil_vif_fwconnecting, vif->status)) {
67 wil_dbg_pm(wil, "Delay suspend when connecting\n");
68 return false;
69 }
70 if (is_runtime) {
71 wil_dbg_pm(wil, "STA-like interface\n");
72 return false;
73 }
74 break;
75 /* AP-like interface - can't suspend */
76 default:
77 wil_dbg_pm(wil, "AP-like interface\n");
78 return false;
79 }
80
81 return true;
82 }
83
wil_can_suspend(struct wil6210_priv * wil,bool is_runtime)84 int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime)
85 {
86 int rc = 0, i;
87 bool wmi_only = test_bit(WMI_FW_CAPABILITY_WMI_ONLY,
88 wil->fw_capabilities);
89 bool active_ifaces;
90
91 wil_dbg_pm(wil, "can_suspend: %s\n", is_runtime ? "runtime" : "system");
92
93 if (wmi_only || debug_fw) {
94 wil_dbg_pm(wil, "Deny any suspend - %s mode\n",
95 wmi_only ? "wmi_only" : "debug_fw");
96 rc = -EBUSY;
97 goto out;
98 }
99 if (is_runtime && !wil->platform_ops.suspend) {
100 rc = -EBUSY;
101 goto out;
102 }
103
104 mutex_lock(&wil->vif_mutex);
105 active_ifaces = wil_has_active_ifaces(wil, true, false);
106 mutex_unlock(&wil->vif_mutex);
107
108 if (!active_ifaces) {
109 /* can always sleep when down */
110 wil_dbg_pm(wil, "Interface is down\n");
111 goto out;
112 }
113 if (test_bit(wil_status_resetting, wil->status)) {
114 wil_dbg_pm(wil, "Delay suspend when resetting\n");
115 rc = -EBUSY;
116 goto out;
117 }
118 if (wil->recovery_state != fw_recovery_idle) {
119 wil_dbg_pm(wil, "Delay suspend during recovery\n");
120 rc = -EBUSY;
121 goto out;
122 }
123
124 /* interface is running */
125 mutex_lock(&wil->vif_mutex);
126 for (i = 0; i < wil->max_vifs; i++) {
127 struct wil6210_vif *vif = wil->vifs[i];
128
129 if (!vif)
130 continue;
131 if (!wil_can_suspend_vif(wil, vif, is_runtime)) {
132 rc = -EBUSY;
133 mutex_unlock(&wil->vif_mutex);
134 goto out;
135 }
136 }
137 mutex_unlock(&wil->vif_mutex);
138
139 out:
140 wil_dbg_pm(wil, "can_suspend: %s => %s (%d)\n",
141 is_runtime ? "runtime" : "system", rc ? "No" : "Yes", rc);
142
143 if (rc)
144 wil->suspend_stats.rejected_by_host++;
145
146 return rc;
147 }
148
wil_resume_keep_radio_on(struct wil6210_priv * wil)149 static int wil_resume_keep_radio_on(struct wil6210_priv *wil)
150 {
151 int rc = 0;
152
153 /* wil_status_resuming will be cleared when getting
154 * WMI_TRAFFIC_RESUME_EVENTID
155 */
156 set_bit(wil_status_resuming, wil->status);
157 clear_bit(wil_status_suspended, wil->status);
158 wil_c(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
159 wil_unmask_irq(wil);
160
161 wil6210_bus_request(wil, wil->bus_request_kbps_pre_suspend);
162
163 /* Send WMI resume request to the device */
164 rc = wmi_resume(wil);
165 if (rc) {
166 wil_err(wil, "device failed to resume (%d)\n", rc);
167 if (no_fw_recovery)
168 goto out;
169 rc = wil_down(wil);
170 if (rc) {
171 wil_err(wil, "wil_down failed (%d)\n", rc);
172 goto out;
173 }
174 rc = wil_up(wil);
175 if (rc) {
176 wil_err(wil, "wil_up failed (%d)\n", rc);
177 goto out;
178 }
179 }
180
181 /* Wake all queues */
182 wil_pm_wake_connected_net_queues(wil);
183
184 out:
185 if (rc)
186 set_bit(wil_status_suspended, wil->status);
187 return rc;
188 }
189
wil_suspend_keep_radio_on(struct wil6210_priv * wil)190 static int wil_suspend_keep_radio_on(struct wil6210_priv *wil)
191 {
192 int rc = 0;
193 unsigned long start, data_comp_to;
194
195 wil_dbg_pm(wil, "suspend keep radio on\n");
196
197 /* Prevent handling of new tx and wmi commands */
198 set_bit(wil_status_suspending, wil->status);
199 if (test_bit(wil_status_collecting_dumps, wil->status)) {
200 /* Device collects crash dump, cancel the suspend */
201 wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
202 clear_bit(wil_status_suspending, wil->status);
203 wil->suspend_stats.rejected_by_host++;
204 return -EBUSY;
205 }
206 wil_pm_stop_all_net_queues(wil);
207
208 if (!wil_is_tx_idle(wil)) {
209 wil_dbg_pm(wil, "Pending TX data, reject suspend\n");
210 wil->suspend_stats.rejected_by_host++;
211 goto reject_suspend;
212 }
213
214 if (!wil->txrx_ops.is_rx_idle(wil)) {
215 wil_dbg_pm(wil, "Pending RX data, reject suspend\n");
216 wil->suspend_stats.rejected_by_host++;
217 goto reject_suspend;
218 }
219
220 if (!wil_is_wmi_idle(wil)) {
221 wil_dbg_pm(wil, "Pending WMI events, reject suspend\n");
222 wil->suspend_stats.rejected_by_host++;
223 goto reject_suspend;
224 }
225
226 /* Send WMI suspend request to the device */
227 rc = wmi_suspend(wil);
228 if (rc) {
229 wil_dbg_pm(wil, "wmi_suspend failed, reject suspend (%d)\n",
230 rc);
231 goto reject_suspend;
232 }
233
234 /* Wait for completion of the pending RX packets */
235 start = jiffies;
236 data_comp_to = jiffies + msecs_to_jiffies(WIL_DATA_COMPLETION_TO_MS);
237 if (test_bit(wil_status_napi_en, wil->status)) {
238 while (!wil->txrx_ops.is_rx_idle(wil)) {
239 if (time_after(jiffies, data_comp_to)) {
240 if (wil->txrx_ops.is_rx_idle(wil))
241 break;
242 wil_err(wil,
243 "TO waiting for idle RX, suspend failed\n");
244 wil->suspend_stats.r_on.failed_suspends++;
245 goto resume_after_fail;
246 }
247 wil_dbg_ratelimited(wil, "rx vring is not empty -> NAPI\n");
248 napi_synchronize(&wil->napi_rx);
249 msleep(20);
250 }
251 }
252
253 /* In case of pending WMI events, reject the suspend
254 * and resume the device.
255 * This can happen if the device sent the WMI events before
256 * approving the suspend.
257 */
258 if (!wil_is_wmi_idle(wil)) {
259 wil_err(wil, "suspend failed due to pending WMI events\n");
260 wil->suspend_stats.r_on.failed_suspends++;
261 goto resume_after_fail;
262 }
263
264 wil_mask_irq(wil);
265
266 /* Disable device reset on PERST */
267 wil_s(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
268
269 if (wil->platform_ops.suspend) {
270 rc = wil->platform_ops.suspend(wil->platform_handle, true);
271 if (rc) {
272 wil_err(wil, "platform device failed to suspend (%d)\n",
273 rc);
274 wil->suspend_stats.r_on.failed_suspends++;
275 wil_c(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
276 wil_unmask_irq(wil);
277 goto resume_after_fail;
278 }
279 }
280
281 /* Save the current bus request to return to the same in resume */
282 wil->bus_request_kbps_pre_suspend = wil->bus_request_kbps;
283 wil6210_bus_request(wil, 0);
284
285 set_bit(wil_status_suspended, wil->status);
286 clear_bit(wil_status_suspending, wil->status);
287
288 return rc;
289
290 resume_after_fail:
291 set_bit(wil_status_resuming, wil->status);
292 clear_bit(wil_status_suspending, wil->status);
293 rc = wmi_resume(wil);
294 /* if resume succeeded, reject the suspend */
295 if (!rc) {
296 rc = -EBUSY;
297 wil_pm_wake_connected_net_queues(wil);
298 }
299 return rc;
300
301 reject_suspend:
302 clear_bit(wil_status_suspending, wil->status);
303 wil_pm_wake_connected_net_queues(wil);
304 return -EBUSY;
305 }
306
wil_suspend_radio_off(struct wil6210_priv * wil)307 static int wil_suspend_radio_off(struct wil6210_priv *wil)
308 {
309 int rc = 0;
310 bool active_ifaces;
311
312 wil_dbg_pm(wil, "suspend radio off\n");
313
314 set_bit(wil_status_suspending, wil->status);
315 if (test_bit(wil_status_collecting_dumps, wil->status)) {
316 /* Device collects crash dump, cancel the suspend */
317 wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
318 clear_bit(wil_status_suspending, wil->status);
319 wil->suspend_stats.rejected_by_host++;
320 return -EBUSY;
321 }
322
323 /* if netif up, hardware is alive, shut it down */
324 mutex_lock(&wil->vif_mutex);
325 active_ifaces = wil_has_active_ifaces(wil, true, false);
326 mutex_unlock(&wil->vif_mutex);
327
328 if (active_ifaces) {
329 rc = wil_down(wil);
330 if (rc) {
331 wil_err(wil, "wil_down : %d\n", rc);
332 wil->suspend_stats.r_off.failed_suspends++;
333 goto out;
334 }
335 }
336
337 /* Disable PCIe IRQ to prevent sporadic IRQs when PCIe is suspending */
338 wil_dbg_pm(wil, "Disabling PCIe IRQ before suspending\n");
339 wil_disable_irq(wil);
340
341 if (wil->platform_ops.suspend) {
342 rc = wil->platform_ops.suspend(wil->platform_handle, false);
343 if (rc) {
344 wil_enable_irq(wil);
345 wil->suspend_stats.r_off.failed_suspends++;
346 goto out;
347 }
348 }
349
350 set_bit(wil_status_suspended, wil->status);
351
352 out:
353 clear_bit(wil_status_suspending, wil->status);
354 wil_dbg_pm(wil, "suspend radio off: %d\n", rc);
355
356 return rc;
357 }
358
wil_resume_radio_off(struct wil6210_priv * wil)359 static int wil_resume_radio_off(struct wil6210_priv *wil)
360 {
361 int rc = 0;
362 bool active_ifaces;
363
364 wil_dbg_pm(wil, "Enabling PCIe IRQ\n");
365 wil_enable_irq(wil);
366 /* if any netif up, bring hardware up
367 * During open(), IFF_UP set after actual device method
368 * invocation. This prevent recursive call to wil_up()
369 * wil_status_suspended will be cleared in wil_reset
370 */
371 mutex_lock(&wil->vif_mutex);
372 active_ifaces = wil_has_active_ifaces(wil, true, false);
373 mutex_unlock(&wil->vif_mutex);
374 if (active_ifaces)
375 rc = wil_up(wil);
376 else
377 clear_bit(wil_status_suspended, wil->status);
378
379 return rc;
380 }
381
wil_suspend(struct wil6210_priv * wil,bool is_runtime,bool keep_radio_on)382 int wil_suspend(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
383 {
384 int rc = 0;
385
386 wil_dbg_pm(wil, "suspend: %s\n", is_runtime ? "runtime" : "system");
387
388 if (test_bit(wil_status_suspended, wil->status)) {
389 wil_dbg_pm(wil, "trying to suspend while suspended\n");
390 return 0;
391 }
392
393 if (!keep_radio_on)
394 rc = wil_suspend_radio_off(wil);
395 else
396 rc = wil_suspend_keep_radio_on(wil);
397
398 wil_dbg_pm(wil, "suspend: %s => %d\n",
399 is_runtime ? "runtime" : "system", rc);
400
401 return rc;
402 }
403
wil_resume(struct wil6210_priv * wil,bool is_runtime,bool keep_radio_on)404 int wil_resume(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
405 {
406 int rc = 0;
407
408 wil_dbg_pm(wil, "resume: %s\n", is_runtime ? "runtime" : "system");
409
410 if (wil->platform_ops.resume) {
411 rc = wil->platform_ops.resume(wil->platform_handle,
412 keep_radio_on);
413 if (rc) {
414 wil_err(wil, "platform_ops.resume : %d\n", rc);
415 goto out;
416 }
417 }
418
419 if (keep_radio_on)
420 rc = wil_resume_keep_radio_on(wil);
421 else
422 rc = wil_resume_radio_off(wil);
423
424 out:
425 wil_dbg_pm(wil, "resume: %s => %d\n", is_runtime ? "runtime" : "system",
426 rc);
427 return rc;
428 }
429
wil_pm_runtime_allow(struct wil6210_priv * wil)430 void wil_pm_runtime_allow(struct wil6210_priv *wil)
431 {
432 struct device *dev = wil_to_dev(wil);
433
434 pm_runtime_put_noidle(dev);
435 pm_runtime_set_autosuspend_delay(dev, WIL6210_AUTOSUSPEND_DELAY_MS);
436 pm_runtime_use_autosuspend(dev);
437 pm_runtime_allow(dev);
438 }
439
wil_pm_runtime_forbid(struct wil6210_priv * wil)440 void wil_pm_runtime_forbid(struct wil6210_priv *wil)
441 {
442 struct device *dev = wil_to_dev(wil);
443
444 pm_runtime_forbid(dev);
445 pm_runtime_get_noresume(dev);
446 }
447
wil_pm_runtime_get(struct wil6210_priv * wil)448 int wil_pm_runtime_get(struct wil6210_priv *wil)
449 {
450 int rc;
451 struct device *dev = wil_to_dev(wil);
452
453 rc = pm_runtime_get_sync(dev);
454 if (rc < 0) {
455 wil_err(wil, "pm_runtime_get_sync() failed, rc = %d\n", rc);
456 pm_runtime_put_noidle(dev);
457 return rc;
458 }
459
460 return 0;
461 }
462
wil_pm_runtime_put(struct wil6210_priv * wil)463 void wil_pm_runtime_put(struct wil6210_priv *wil)
464 {
465 struct device *dev = wil_to_dev(wil);
466
467 pm_runtime_mark_last_busy(dev);
468 pm_runtime_put_autosuspend(dev);
469 }
470
