include/linux/pm_runtime.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * pm_runtime.h - Device run-time power management helper functions.
   4  *
   5  * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
   6  */
   7
   8 #ifndef _LINUX_PM_RUNTIME_H
   9 #define _LINUX_PM_RUNTIME_H
  10
  11 #include <linux/device.h>
  12 #include <linux/notifier.h>
  13 #include <linux/pm.h>
  14
  15 #include <linux/jiffies.h>
  16
  17 /* Runtime PM flag argument bits */
  18 #define RPM_ASYNC               0x01    /* Request is asynchronous */
  19 #define RPM_NOWAIT              0x02    /* Don't wait for concurrent
  20                                             state change */
  21 #define RPM_GET_PUT             0x04    /* Increment/decrement the
  22                                             usage_count */
  23 #define RPM_AUTO                0x08    /* Use autosuspend_delay */
  24
  25 /*
  26  * Use this for defining a set of PM operations to be used in all situations
  27  * (system suspend, hibernation or runtime PM).
  28  *
  29  * Note that the behaviour differs from the deprecated UNIVERSAL_DEV_PM_OPS()
  30  * macro, which uses the provided callbacks for both runtime PM and system
  31  * sleep, while DEFINE_RUNTIME_DEV_PM_OPS() uses pm_runtime_force_suspend()
  32  * and pm_runtime_force_resume() for its system sleep callbacks.
  33  *
  34  * If the underlying dev_pm_ops struct symbol has to be exported, use
  35  * EXPORT_RUNTIME_DEV_PM_OPS() or EXPORT_GPL_RUNTIME_DEV_PM_OPS() instead.
  36  */
  37 #define DEFINE_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
  38         _DEFINE_DEV_PM_OPS(name, pm_runtime_force_suspend, \
  39                            pm_runtime_force_resume, suspend_fn, \
  40                            resume_fn, idle_fn)
  41
  42 #define EXPORT_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
  43         EXPORT_DEV_PM_OPS(name) = { \
  44                 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
  45         }
  46 #define EXPORT_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
  47         EXPORT_GPL_DEV_PM_OPS(name) = { \
  48                 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
  49         }
  50 #define EXPORT_NS_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \
  51         EXPORT_NS_DEV_PM_OPS(name, ns) = { \
  52                 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
  53         }
  54 #define EXPORT_NS_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \
  55         EXPORT_NS_GPL_DEV_PM_OPS(name, ns) = { \
  56                 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
  57         }
  58
  59 #ifdef CONFIG_PM
  60 extern struct workqueue_struct *pm_wq;
  61
  62 static inline bool queue_pm_work(struct work_struct *work)
  63 {
  64         return queue_work(pm_wq, work);
  65 }
  66
  67 extern int pm_generic_runtime_suspend(struct device *dev);
  68 extern int pm_generic_runtime_resume(struct device *dev);
  69 extern int pm_runtime_force_suspend(struct device *dev);
  70 extern int pm_runtime_force_resume(struct device *dev);
  71
  72 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
  73 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
  74 extern int __pm_runtime_resume(struct device *dev, int rpmflags);
  75 extern int pm_runtime_get_if_active(struct device *dev);
  76 extern int pm_runtime_get_if_in_use(struct device *dev);
  77 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
  78 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  79 extern int pm_runtime_barrier(struct device *dev);
  80 extern void pm_runtime_enable(struct device *dev);
  81 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
  82 extern void pm_runtime_allow(struct device *dev);
  83 extern void pm_runtime_forbid(struct device *dev);
  84 extern void pm_runtime_no_callbacks(struct device *dev);
  85 extern void pm_runtime_irq_safe(struct device *dev);
  86 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
  87 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
  88 extern u64 pm_runtime_autosuspend_expiration(struct device *dev);
  89 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
  90 extern void pm_runtime_get_suppliers(struct device *dev);
  91 extern void pm_runtime_put_suppliers(struct device *dev);
  92 extern void pm_runtime_new_link(struct device *dev);
  93 extern void pm_runtime_drop_link(struct device_link *link);
  94 extern void pm_runtime_release_supplier(struct device_link *link);
  95
  96 extern int devm_pm_runtime_enable(struct device *dev);
  97
  98 /**
  99  * pm_suspend_ignore_children - Set runtime PM behavior regarding children.
 100  * @dev: Target device.
 101  * @enable: Whether or not to ignore possible dependencies on children.
 102  *
 103  * The dependencies of @dev on its children will not be taken into account by
 104  * the runtime PM framework going forward if @enable is %true, or they will
 105  * be taken into account otherwise.
 106  */
 107 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
 108 {
 109         dev->power.ignore_children = enable;
 110 }
 111
 112 /**
 113  * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
 114  * @dev: Target device.
 115  */
 116 static inline void pm_runtime_get_noresume(struct device *dev)
 117 {
 118         atomic_inc(&dev->power.usage_count);
 119 }
 120
 121 /**
 122  * pm_runtime_put_noidle - Drop runtime PM usage counter of a device.
 123  * @dev: Target device.
 124  *
 125  * Decrement the runtime PM usage counter of @dev unless it is 0 already.
 126  */
 127 static inline void pm_runtime_put_noidle(struct device *dev)
 128 {
 129         atomic_add_unless(&dev->power.usage_count, -1, 0);
 130 }
 131
 132 /**
 133  * pm_runtime_suspended - Check whether or not a device is runtime-suspended.
 134  * @dev: Target device.
 135  *
 136  * Return %true if runtime PM is enabled for @dev and its runtime PM status is
 137  * %RPM_SUSPENDED, or %false otherwise.
 138  *
 139  * Note that the return value of this function can only be trusted if it is
 140  * called under the runtime PM lock of @dev or under conditions in which
 141  * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
 142  * status cannot change.
 143  */
 144 static inline bool pm_runtime_suspended(struct device *dev)
 145 {
 146         return dev->power.runtime_status == RPM_SUSPENDED
 147                 && !dev->power.disable_depth;
 148 }
 149
 150 /**
 151  * pm_runtime_active - Check whether or not a device is runtime-active.
 152  * @dev: Target device.
 153  *
 154  * Return %true if runtime PM is disabled for @dev or its runtime PM status is
 155  * %RPM_ACTIVE, or %false otherwise.
 156  *
 157  * Note that the return value of this function can only be trusted if it is
 158  * called under the runtime PM lock of @dev or under conditions in which
 159  * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
 160  * status cannot change.
 161  */
 162 static inline bool pm_runtime_active(struct device *dev)
 163 {
 164         return dev->power.runtime_status == RPM_ACTIVE
 165                 || dev->power.disable_depth;
 166 }
 167
 168 /**
 169  * pm_runtime_status_suspended - Check if runtime PM status is "suspended".
 170  * @dev: Target device.
 171  *
 172  * Return %true if the runtime PM status of @dev is %RPM_SUSPENDED, or %false
 173  * otherwise, regardless of whether or not runtime PM has been enabled for @dev.
 174  *
 175  * Note that the return value of this function can only be trusted if it is
 176  * called under the runtime PM lock of @dev or under conditions in which the
 177  * runtime PM status of @dev cannot change.
 178  */
 179 static inline bool pm_runtime_status_suspended(struct device *dev)
 180 {
 181         return dev->power.runtime_status == RPM_SUSPENDED;
 182 }
 183
 184 /**
 185  * pm_runtime_enabled - Check if runtime PM is enabled.
 186  * @dev: Target device.
 187  *
 188  * Return %true if runtime PM is enabled for @dev or %false otherwise.
 189  *
 190  * Note that the return value of this function can only be trusted if it is
 191  * called under the runtime PM lock of @dev or under conditions in which
 192  * runtime PM cannot be either disabled or enabled for @dev.
 193  */
 194 static inline bool pm_runtime_enabled(struct device *dev)
 195 {
 196         return !dev->power.disable_depth;
 197 }
 198
 199 /**
 200  * pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present.
 201  * @dev: Target device.
 202  *
 203  * Return %true if @dev is a special device without runtime PM callbacks or
 204  * %false otherwise.
 205  */
 206 static inline bool pm_runtime_has_no_callbacks(struct device *dev)
 207 {
 208         return dev->power.no_callbacks;
 209 }
 210
 211 /**
 212  * pm_runtime_mark_last_busy - Update the last access time of a device.
 213  * @dev: Target device.
 214  *
 215  * Update the last access time of @dev used by the runtime PM autosuspend
 216  * mechanism to the current time as returned by ktime_get_mono_fast_ns().
 217  */
 218 static inline void pm_runtime_mark_last_busy(struct device *dev)
 219 {
 220         WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
 221 }
 222
 223 /**
 224  * pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context.
 225  * @dev: Target device.
 226  *
 227  * Return %true if @dev has been marked as an "IRQ-safe" device (with respect
 228  * to runtime PM), in which case its runtime PM callabcks can be expected to
 229  * work correctly when invoked from interrupt handlers.
 230  */
 231 static inline bool pm_runtime_is_irq_safe(struct device *dev)
 232 {
 233         return dev->power.irq_safe;
 234 }
 235
 236 extern u64 pm_runtime_suspended_time(struct device *dev);
 237
 238 #else /* !CONFIG_PM */
 239
 240 static inline bool queue_pm_work(struct work_struct *work) { return false; }
 241
 242 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
 243 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
 244 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
 245 static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
 246
 247 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
 248 {
 249         return -ENOSYS;
 250 }
 251 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
 252 {
 253         return -ENOSYS;
 254 }
 255 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
 256 {
 257         return 1;
 258 }
 259 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
 260 {
 261         return -ENOSYS;
 262 }
 263 static inline int pm_runtime_get_if_in_use(struct device *dev)
 264 {
 265         return -EINVAL;
 266 }
 267 static inline int pm_runtime_get_if_active(struct device *dev)
 268 {
 269         return -EINVAL;
 270 }
 271 static inline int __pm_runtime_set_status(struct device *dev,
 272                                             unsigned int status) { return 0; }
 273 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
 274 static inline void pm_runtime_enable(struct device *dev) {}
 275 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
 276 static inline void pm_runtime_allow(struct device *dev) {}
 277 static inline void pm_runtime_forbid(struct device *dev) {}
 278
 279 static inline int devm_pm_runtime_enable(struct device *dev) { return 0; }
 280
 281 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
 282 static inline void pm_runtime_get_noresume(struct device *dev) {}
 283 static inline void pm_runtime_put_noidle(struct device *dev) {}
 284 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
 285 static inline bool pm_runtime_active(struct device *dev) { return true; }
 286 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
 287 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
 288
 289 static inline void pm_runtime_no_callbacks(struct device *dev) {}
 290 static inline void pm_runtime_irq_safe(struct device *dev) {}
 291 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
 292
 293 static inline bool pm_runtime_has_no_callbacks(struct device *dev) { return false; }
 294 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
 295 static inline void __pm_runtime_use_autosuspend(struct device *dev,
 296                                                 bool use) {}
 297 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
 298                                                 int delay) {}
 299 static inline u64 pm_runtime_autosuspend_expiration(
 300                                 struct device *dev) { return 0; }
 301 static inline void pm_runtime_set_memalloc_noio(struct device *dev,
 302                                                 bool enable){}
 303 static inline void pm_runtime_get_suppliers(struct device *dev) {}
 304 static inline void pm_runtime_put_suppliers(struct device *dev) {}
 305 static inline void pm_runtime_new_link(struct device *dev) {}
 306 static inline void pm_runtime_drop_link(struct device_link *link) {}
 307 static inline void pm_runtime_release_supplier(struct device_link *link) {}
 308
 309 #endif /* !CONFIG_PM */
 310
 311 /**
 312  * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
 313  * @dev: Target device.
 314  *
 315  * Invoke the "idle check" callback of @dev and, depending on its return value,
 316  * set up autosuspend of @dev or suspend it (depending on whether or not
 317  * autosuspend has been enabled for it).
 318  */
 319 static inline int pm_runtime_idle(struct device *dev)
 320 {
 321         return __pm_runtime_idle(dev, 0);
 322 }
 323
 324 /**
 325  * pm_runtime_suspend - Suspend a device synchronously.
 326  * @dev: Target device.
 327  */
 328 static inline int pm_runtime_suspend(struct device *dev)
 329 {
 330         return __pm_runtime_suspend(dev, 0);
 331 }
 332
 333 /**
 334  * pm_runtime_autosuspend - Set up autosuspend of a device or suspend it.
 335  * @dev: Target device.
 336  *
 337  * Set up autosuspend of @dev or suspend it (depending on whether or not
 338  * autosuspend is enabled for it) without engaging its "idle check" callback.
 339  */
 340 static inline int pm_runtime_autosuspend(struct device *dev)
 341 {
 342         return __pm_runtime_suspend(dev, RPM_AUTO);
 343 }
 344
 345 /**
 346  * pm_runtime_resume - Resume a device synchronously.
 347  * @dev: Target device.
 348  */
 349 static inline int pm_runtime_resume(struct device *dev)
 350 {
 351         return __pm_runtime_resume(dev, 0);
 352 }
 353
 354 /**
 355  * pm_request_idle - Queue up "idle check" execution for a device.
 356  * @dev: Target device.
 357  *
 358  * Queue up a work item to run an equivalent of pm_runtime_idle() for @dev
 359  * asynchronously.
 360  */
 361 static inline int pm_request_idle(struct device *dev)
 362 {
 363         return __pm_runtime_idle(dev, RPM_ASYNC);
 364 }
 365
 366 /**
 367  * pm_request_resume - Queue up runtime-resume of a device.
 368  * @dev: Target device.
 369  */
 370 static inline int pm_request_resume(struct device *dev)
 371 {
 372         return __pm_runtime_resume(dev, RPM_ASYNC);
 373 }
 374
 375 /**
 376  * pm_request_autosuspend - Queue up autosuspend of a device.
 377  * @dev: Target device.
 378  *
 379  * Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev
 380  * asynchronously.
 381  */
 382 static inline int pm_request_autosuspend(struct device *dev)
 383 {
 384         return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
 385 }
 386
 387 /**
 388  * pm_runtime_get - Bump up usage counter and queue up resume of a device.
 389  * @dev: Target device.
 390  *
 391  * Bump up the runtime PM usage counter of @dev and queue up a work item to
 392  * carry out runtime-resume of it.
 393  */
 394 static inline int pm_runtime_get(struct device *dev)
 395 {
 396         return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
 397 }
 398
 399 /**
 400  * pm_runtime_get_sync - Bump up usage counter of a device and resume it.
 401  * @dev: Target device.
 402  *
 403  * Bump up the runtime PM usage counter of @dev and carry out runtime-resume of
 404  * it synchronously.
 405  *
 406  * The possible return values of this function are the same as for
 407  * pm_runtime_resume() and the runtime PM usage counter of @dev remains
 408  * incremented in all cases, even if it returns an error code.
 409  * Consider using pm_runtime_resume_and_get() instead of it, especially
 410  * if its return value is checked by the caller, as this is likely to result
 411  * in cleaner code.
 412  */
 413 static inline int pm_runtime_get_sync(struct device *dev)
 414 {
 415         return __pm_runtime_resume(dev, RPM_GET_PUT);
 416 }
 417
 418 /**
 419  * pm_runtime_resume_and_get - Bump up usage counter of a device and resume it.
 420  * @dev: Target device.
 421  *
 422  * Resume @dev synchronously and if that is successful, increment its runtime
 423  * PM usage counter. Return 0 if the runtime PM usage counter of @dev has been
 424  * incremented or a negative error code otherwise.
 425  */
 426 static inline int pm_runtime_resume_and_get(struct device *dev)
 427 {
 428         int ret;
 429
 430         ret = __pm_runtime_resume(dev, RPM_GET_PUT);
 431         if (ret < 0) {
 432                 pm_runtime_put_noidle(dev);
 433                 return ret;
 434         }
 435
 436         return 0;
 437 }
 438
 439 /**
 440  * pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
 441  * @dev: Target device.
 442  *
 443  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 444  * equal to 0, queue up a work item for @dev like in pm_request_idle().
 445  */
 446 static inline int pm_runtime_put(struct device *dev)
 447 {
 448         return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
 449 }
 450
 451 /**
 452  * __pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
 453  * @dev: Target device.
 454  *
 455  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 456  * equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
 457  */
 458 static inline int __pm_runtime_put_autosuspend(struct device *dev)
 459 {
 460         return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
 461 }
 462
 463 /**
 464  * pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
 465  * @dev: Target device.
 466  *
 467  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 468  * equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
 469  */
 470 static inline int pm_runtime_put_autosuspend(struct device *dev)
 471 {
 472         return __pm_runtime_suspend(dev,
 473             RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
 474 }
 475
 476 /**
 477  * pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.
 478  * @dev: Target device.
 479  *
 480  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 481  * equal to 0, invoke the "idle check" callback of @dev and, depending on its
 482  * return value, set up autosuspend of @dev or suspend it (depending on whether
 483  * or not autosuspend has been enabled for it).
 484  *
 485  * The possible return values of this function are the same as for
 486  * pm_runtime_idle() and the runtime PM usage counter of @dev remains
 487  * decremented in all cases, even if it returns an error code.
 488  */
 489 static inline int pm_runtime_put_sync(struct device *dev)
 490 {
 491         return __pm_runtime_idle(dev, RPM_GET_PUT);
 492 }
 493
 494 /**
 495  * pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0.
 496  * @dev: Target device.
 497  *
 498  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 499  * equal to 0, carry out runtime-suspend of @dev synchronously.
 500  *
 501  * The possible return values of this function are the same as for
 502  * pm_runtime_suspend() and the runtime PM usage counter of @dev remains
 503  * decremented in all cases, even if it returns an error code.
 504  */
 505 static inline int pm_runtime_put_sync_suspend(struct device *dev)
 506 {
 507         return __pm_runtime_suspend(dev, RPM_GET_PUT);
 508 }
 509
 510 /**
 511  * pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0.
 512  * @dev: Target device.
 513  *
 514  * Decrement the runtime PM usage counter of @dev and if it turns out to be
 515  * equal to 0, set up autosuspend of @dev or suspend it synchronously (depending
 516  * on whether or not autosuspend has been enabled for it).
 517  *
 518  * The possible return values of this function are the same as for
 519  * pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains
 520  * decremented in all cases, even if it returns an error code.
 521  */
 522 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
 523 {
 524         return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
 525 }
 526
 527 /**
 528  * pm_runtime_set_active - Set runtime PM status to "active".
 529  * @dev: Target device.
 530  *
 531  * Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies
 532  * of it will be taken into account.
 533  *
 534  * It is not valid to call this function for devices with runtime PM enabled.
 535  */
 536 static inline int pm_runtime_set_active(struct device *dev)
 537 {
 538         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 539 }
 540
 541 /**
 542  * pm_runtime_set_suspended - Set runtime PM status to "suspended".
 543  * @dev: Target device.
 544  *
 545  * Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that
 546  * dependencies of it will be taken into account.
 547  *
 548  * It is not valid to call this function for devices with runtime PM enabled.
 549  */
 550 static inline int pm_runtime_set_suspended(struct device *dev)
 551 {
 552         return __pm_runtime_set_status(dev, RPM_SUSPENDED);
 553 }
 554
 555 /**
 556  * pm_runtime_disable - Disable runtime PM for a device.
 557  * @dev: Target device.
 558  *
 559  * Prevent the runtime PM framework from working with @dev (by incrementing its
 560  * "blocking" counter).
 561  *
 562  * For each invocation of this function for @dev there must be a matching
 563  * pm_runtime_enable() call in order for runtime PM to be enabled for it.
 564  */
 565 static inline void pm_runtime_disable(struct device *dev)
 566 {
 567         __pm_runtime_disable(dev, true);
 568 }
 569
 570 /**
 571  * pm_runtime_use_autosuspend - Allow autosuspend to be used for a device.
 572  * @dev: Target device.
 573  *
 574  * Allow the runtime PM autosuspend mechanism to be used for @dev whenever
 575  * requested (or "autosuspend" will be handled as direct runtime-suspend for
 576  * it).
 577  *
 578  * NOTE: It's important to undo this with pm_runtime_dont_use_autosuspend()
 579  * at driver exit time unless your driver initially enabled pm_runtime
 580  * with devm_pm_runtime_enable() (which handles it for you).
 581  */
 582 static inline void pm_runtime_use_autosuspend(struct device *dev)
 583 {
 584         __pm_runtime_use_autosuspend(dev, true);
 585 }
 586
 587 /**
 588  * pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used.
 589  * @dev: Target device.
 590  *
 591  * Prevent the runtime PM autosuspend mechanism from being used for @dev which
 592  * means that "autosuspend" will be handled as direct runtime-suspend for it
 593  * going forward.
 594  */
 595 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
 596 {
 597         __pm_runtime_use_autosuspend(dev, false);
 598 }
 599
 600 #endif