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