1f721889fSRafael J. Wysocki /* 2f721889fSRafael J. Wysocki * drivers/base/power/domain.c - Common code related to device power domains. 3f721889fSRafael J. Wysocki * 4f721889fSRafael J. Wysocki * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. 5f721889fSRafael J. Wysocki * 6f721889fSRafael J. Wysocki * This file is released under the GPLv2. 7f721889fSRafael J. Wysocki */ 8f721889fSRafael J. Wysocki 9f721889fSRafael J. Wysocki #include <linux/init.h> 10f721889fSRafael J. Wysocki #include <linux/kernel.h> 11f721889fSRafael J. Wysocki #include <linux/io.h> 12f721889fSRafael J. Wysocki #include <linux/pm_runtime.h> 13f721889fSRafael J. Wysocki #include <linux/pm_domain.h> 14f721889fSRafael J. Wysocki #include <linux/slab.h> 15f721889fSRafael J. Wysocki #include <linux/err.h> 1617b75ecaSRafael J. Wysocki #include <linux/sched.h> 1717b75ecaSRafael J. Wysocki #include <linux/suspend.h> 18f721889fSRafael J. Wysocki 195248051bSRafael J. Wysocki #ifdef CONFIG_PM 205248051bSRafael J. Wysocki 215248051bSRafael J. Wysocki static struct generic_pm_domain *dev_to_genpd(struct device *dev) 225248051bSRafael J. Wysocki { 235248051bSRafael J. Wysocki if (IS_ERR_OR_NULL(dev->pm_domain)) 245248051bSRafael J. Wysocki return ERR_PTR(-EINVAL); 255248051bSRafael J. Wysocki 26596ba34bSRafael J. Wysocki return pd_to_genpd(dev->pm_domain); 275248051bSRafael J. Wysocki } 28f721889fSRafael J. Wysocki 29f721889fSRafael J. Wysocki static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) 30f721889fSRafael J. Wysocki { 31f721889fSRafael J. Wysocki if (!WARN_ON(genpd->sd_count == 0)) 32f721889fSRafael J. Wysocki genpd->sd_count--; 33f721889fSRafael J. Wysocki } 34f721889fSRafael J. Wysocki 3517b75ecaSRafael J. Wysocki static void genpd_acquire_lock(struct generic_pm_domain *genpd) 3617b75ecaSRafael J. Wysocki { 3717b75ecaSRafael J. Wysocki DEFINE_WAIT(wait); 3817b75ecaSRafael J. Wysocki 3917b75ecaSRafael J. Wysocki mutex_lock(&genpd->lock); 4017b75ecaSRafael J. Wysocki /* 4117b75ecaSRafael J. Wysocki * Wait for the domain to transition into either the active, 4217b75ecaSRafael J. Wysocki * or the power off state. 4317b75ecaSRafael J. Wysocki */ 4417b75ecaSRafael J. Wysocki for (;;) { 4517b75ecaSRafael J. Wysocki prepare_to_wait(&genpd->status_wait_queue, &wait, 4617b75ecaSRafael J. Wysocki TASK_UNINTERRUPTIBLE); 47c6d22b37SRafael J. Wysocki if (genpd->status == GPD_STATE_ACTIVE 48c6d22b37SRafael J. Wysocki || genpd->status == GPD_STATE_POWER_OFF) 4917b75ecaSRafael J. Wysocki break; 5017b75ecaSRafael J. Wysocki mutex_unlock(&genpd->lock); 5117b75ecaSRafael J. Wysocki 5217b75ecaSRafael J. Wysocki schedule(); 5317b75ecaSRafael J. Wysocki 5417b75ecaSRafael J. Wysocki mutex_lock(&genpd->lock); 5517b75ecaSRafael J. Wysocki } 5617b75ecaSRafael J. Wysocki finish_wait(&genpd->status_wait_queue, &wait); 5717b75ecaSRafael J. Wysocki } 5817b75ecaSRafael J. Wysocki 5917b75ecaSRafael J. Wysocki static void genpd_release_lock(struct generic_pm_domain *genpd) 6017b75ecaSRafael J. Wysocki { 6117b75ecaSRafael J. Wysocki mutex_unlock(&genpd->lock); 6217b75ecaSRafael J. Wysocki } 6317b75ecaSRafael J. Wysocki 64c6d22b37SRafael J. Wysocki static void genpd_set_active(struct generic_pm_domain *genpd) 65c6d22b37SRafael J. Wysocki { 66c6d22b37SRafael J. Wysocki if (genpd->resume_count == 0) 67c6d22b37SRafael J. Wysocki genpd->status = GPD_STATE_ACTIVE; 68c6d22b37SRafael J. Wysocki } 69c6d22b37SRafael J. Wysocki 70f721889fSRafael J. Wysocki /** 715248051bSRafael J. Wysocki * pm_genpd_poweron - Restore power to a given PM domain and its parents. 725248051bSRafael J. Wysocki * @genpd: PM domain to power up. 735248051bSRafael J. Wysocki * 745248051bSRafael J. Wysocki * Restore power to @genpd and all of its parents so that it is possible to 755248051bSRafael J. Wysocki * resume a device belonging to it. 765248051bSRafael J. Wysocki */ 7718b4f3f5SMagnus Damm int pm_genpd_poweron(struct generic_pm_domain *genpd) 785248051bSRafael J. Wysocki { 7917b75ecaSRafael J. Wysocki struct generic_pm_domain *parent = genpd->parent; 8017b75ecaSRafael J. Wysocki DEFINE_WAIT(wait); 815248051bSRafael J. Wysocki int ret = 0; 825248051bSRafael J. Wysocki 835248051bSRafael J. Wysocki start: 8417b75ecaSRafael J. Wysocki if (parent) { 85c6d22b37SRafael J. Wysocki genpd_acquire_lock(parent); 865248051bSRafael J. Wysocki mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); 8717b75ecaSRafael J. Wysocki } else { 8817b75ecaSRafael J. Wysocki mutex_lock(&genpd->lock); 8917b75ecaSRafael J. Wysocki } 9017b75ecaSRafael J. Wysocki 9117b75ecaSRafael J. Wysocki if (genpd->status == GPD_STATE_ACTIVE 92596ba34bSRafael J. Wysocki || (genpd->prepared_count > 0 && genpd->suspend_power_off)) 935248051bSRafael J. Wysocki goto out; 945248051bSRafael J. Wysocki 95c6d22b37SRafael J. Wysocki if (genpd->status != GPD_STATE_POWER_OFF) { 96c6d22b37SRafael J. Wysocki genpd_set_active(genpd); 97c6d22b37SRafael J. Wysocki goto out; 98c6d22b37SRafael J. Wysocki } 99c6d22b37SRafael J. Wysocki 10017b75ecaSRafael J. Wysocki if (parent && parent->status != GPD_STATE_ACTIVE) { 1015248051bSRafael J. Wysocki mutex_unlock(&genpd->lock); 102c6d22b37SRafael J. Wysocki genpd_release_lock(parent); 1035248051bSRafael J. Wysocki 10417b75ecaSRafael J. Wysocki ret = pm_genpd_poweron(parent); 1055248051bSRafael J. Wysocki if (ret) 1065248051bSRafael J. Wysocki return ret; 1075248051bSRafael J. Wysocki 1085248051bSRafael J. Wysocki goto start; 1095248051bSRafael J. Wysocki } 1105248051bSRafael J. Wysocki 1115248051bSRafael J. Wysocki if (genpd->power_on) { 1125248051bSRafael J. Wysocki int ret = genpd->power_on(genpd); 1135248051bSRafael J. Wysocki if (ret) 1145248051bSRafael J. Wysocki goto out; 1155248051bSRafael J. Wysocki } 1165248051bSRafael J. Wysocki 117c6d22b37SRafael J. Wysocki genpd_set_active(genpd); 11817b75ecaSRafael J. Wysocki if (parent) 11917b75ecaSRafael J. Wysocki parent->sd_count++; 1205248051bSRafael J. Wysocki 1215248051bSRafael J. Wysocki out: 1225248051bSRafael J. Wysocki mutex_unlock(&genpd->lock); 12317b75ecaSRafael J. Wysocki if (parent) 124c6d22b37SRafael J. Wysocki genpd_release_lock(parent); 1255248051bSRafael J. Wysocki 1265248051bSRafael J. Wysocki return ret; 1275248051bSRafael J. Wysocki } 1285248051bSRafael J. Wysocki 1295248051bSRafael J. Wysocki #endif /* CONFIG_PM */ 1305248051bSRafael J. Wysocki 1315248051bSRafael J. Wysocki #ifdef CONFIG_PM_RUNTIME 1325248051bSRafael J. Wysocki 1335248051bSRafael J. Wysocki /** 134f721889fSRafael J. Wysocki * __pm_genpd_save_device - Save the pre-suspend state of a device. 135f721889fSRafael J. Wysocki * @dle: Device list entry of the device to save the state of. 136f721889fSRafael J. Wysocki * @genpd: PM domain the device belongs to. 137f721889fSRafael J. Wysocki */ 138f721889fSRafael J. Wysocki static int __pm_genpd_save_device(struct dev_list_entry *dle, 139f721889fSRafael J. Wysocki struct generic_pm_domain *genpd) 14017b75ecaSRafael J. Wysocki __releases(&genpd->lock) __acquires(&genpd->lock) 141f721889fSRafael J. Wysocki { 142f721889fSRafael J. Wysocki struct device *dev = dle->dev; 143f721889fSRafael J. Wysocki struct device_driver *drv = dev->driver; 144f721889fSRafael J. Wysocki int ret = 0; 145f721889fSRafael J. Wysocki 146f721889fSRafael J. Wysocki if (dle->need_restore) 147f721889fSRafael J. Wysocki return 0; 148f721889fSRafael J. Wysocki 14917b75ecaSRafael J. Wysocki mutex_unlock(&genpd->lock); 15017b75ecaSRafael J. Wysocki 151f721889fSRafael J. Wysocki if (drv && drv->pm && drv->pm->runtime_suspend) { 152f721889fSRafael J. Wysocki if (genpd->start_device) 153f721889fSRafael J. Wysocki genpd->start_device(dev); 154f721889fSRafael J. Wysocki 155f721889fSRafael J. Wysocki ret = drv->pm->runtime_suspend(dev); 156f721889fSRafael J. Wysocki 157f721889fSRafael J. Wysocki if (genpd->stop_device) 158f721889fSRafael J. Wysocki genpd->stop_device(dev); 159f721889fSRafael J. Wysocki } 160f721889fSRafael J. Wysocki 16117b75ecaSRafael J. Wysocki mutex_lock(&genpd->lock); 16217b75ecaSRafael J. Wysocki 163f721889fSRafael J. Wysocki if (!ret) 164f721889fSRafael J. Wysocki dle->need_restore = true; 165f721889fSRafael J. Wysocki 166f721889fSRafael J. Wysocki return ret; 167f721889fSRafael J. Wysocki } 168f721889fSRafael J. Wysocki 169f721889fSRafael J. Wysocki /** 170f721889fSRafael J. Wysocki * __pm_genpd_restore_device - Restore the pre-suspend state of a device. 171f721889fSRafael J. Wysocki * @dle: Device list entry of the device to restore the state of. 172f721889fSRafael J. Wysocki * @genpd: PM domain the device belongs to. 173f721889fSRafael J. Wysocki */ 174f721889fSRafael J. Wysocki static void __pm_genpd_restore_device(struct dev_list_entry *dle, 175f721889fSRafael J. Wysocki struct generic_pm_domain *genpd) 17617b75ecaSRafael J. Wysocki __releases(&genpd->lock) __acquires(&genpd->lock) 177f721889fSRafael J. Wysocki { 178f721889fSRafael J. Wysocki struct device *dev = dle->dev; 179f721889fSRafael J. Wysocki struct device_driver *drv = dev->driver; 180f721889fSRafael J. Wysocki 181f721889fSRafael J. Wysocki if (!dle->need_restore) 182f721889fSRafael J. Wysocki return; 183f721889fSRafael J. Wysocki 18417b75ecaSRafael J. Wysocki mutex_unlock(&genpd->lock); 18517b75ecaSRafael J. Wysocki 186f721889fSRafael J. Wysocki if (drv && drv->pm && drv->pm->runtime_resume) { 187f721889fSRafael J. Wysocki if (genpd->start_device) 188f721889fSRafael J. Wysocki genpd->start_device(dev); 189f721889fSRafael J. Wysocki 190f721889fSRafael J. Wysocki drv->pm->runtime_resume(dev); 191f721889fSRafael J. Wysocki 192f721889fSRafael J. Wysocki if (genpd->stop_device) 193f721889fSRafael J. Wysocki genpd->stop_device(dev); 194f721889fSRafael J. Wysocki } 195f721889fSRafael J. Wysocki 19617b75ecaSRafael J. Wysocki mutex_lock(&genpd->lock); 19717b75ecaSRafael J. Wysocki 198f721889fSRafael J. Wysocki dle->need_restore = false; 199f721889fSRafael J. Wysocki } 200f721889fSRafael J. Wysocki 201f721889fSRafael J. Wysocki /** 202c6d22b37SRafael J. Wysocki * genpd_abort_poweroff - Check if a PM domain power off should be aborted. 203c6d22b37SRafael J. Wysocki * @genpd: PM domain to check. 204c6d22b37SRafael J. Wysocki * 205c6d22b37SRafael J. Wysocki * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during 206c6d22b37SRafael J. Wysocki * a "power off" operation, which means that a "power on" has occured in the 207c6d22b37SRafael J. Wysocki * meantime, or if its resume_count field is different from zero, which means 208c6d22b37SRafael J. Wysocki * that one of its devices has been resumed in the meantime. 209c6d22b37SRafael J. Wysocki */ 210c6d22b37SRafael J. Wysocki static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) 211c6d22b37SRafael J. Wysocki { 212c6d22b37SRafael J. Wysocki return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; 213c6d22b37SRafael J. Wysocki } 214c6d22b37SRafael J. Wysocki 215c6d22b37SRafael J. Wysocki /** 21656375fd4SRafael J. Wysocki * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). 21756375fd4SRafael J. Wysocki * @genpd: PM domait to power off. 21856375fd4SRafael J. Wysocki * 21956375fd4SRafael J. Wysocki * Queue up the execution of pm_genpd_poweroff() unless it's already been done 22056375fd4SRafael J. Wysocki * before. 22156375fd4SRafael J. Wysocki */ 22256375fd4SRafael J. Wysocki static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) 22356375fd4SRafael J. Wysocki { 22456375fd4SRafael J. Wysocki if (!work_pending(&genpd->power_off_work)) 22556375fd4SRafael J. Wysocki queue_work(pm_wq, &genpd->power_off_work); 22656375fd4SRafael J. Wysocki } 22756375fd4SRafael J. Wysocki 22856375fd4SRafael J. Wysocki /** 229f721889fSRafael J. Wysocki * pm_genpd_poweroff - Remove power from a given PM domain. 230f721889fSRafael J. Wysocki * @genpd: PM domain to power down. 231f721889fSRafael J. Wysocki * 232f721889fSRafael J. Wysocki * If all of the @genpd's devices have been suspended and all of its subdomains 233f721889fSRafael J. Wysocki * have been powered down, run the runtime suspend callbacks provided by all of 234f721889fSRafael J. Wysocki * the @genpd's devices' drivers and remove power from @genpd. 235f721889fSRafael J. Wysocki */ 236f721889fSRafael J. Wysocki static int pm_genpd_poweroff(struct generic_pm_domain *genpd) 23717b75ecaSRafael J. Wysocki __releases(&genpd->lock) __acquires(&genpd->lock) 238f721889fSRafael J. Wysocki { 239f721889fSRafael J. Wysocki struct generic_pm_domain *parent; 240f721889fSRafael J. Wysocki struct dev_list_entry *dle; 241f721889fSRafael J. Wysocki unsigned int not_suspended; 242c6d22b37SRafael J. Wysocki int ret = 0; 243f721889fSRafael J. Wysocki 244c6d22b37SRafael J. Wysocki start: 245c6d22b37SRafael J. Wysocki /* 246c6d22b37SRafael J. Wysocki * Do not try to power off the domain in the following situations: 247c6d22b37SRafael J. Wysocki * (1) The domain is already in the "power off" state. 248c6d22b37SRafael J. Wysocki * (2) System suspend is in progress. 249c6d22b37SRafael J. Wysocki * (3) One of the domain's devices is being resumed right now. 250c6d22b37SRafael J. Wysocki */ 251c6d22b37SRafael J. Wysocki if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 252c6d22b37SRafael J. Wysocki || genpd->resume_count > 0) 253f721889fSRafael J. Wysocki return 0; 254f721889fSRafael J. Wysocki 255f721889fSRafael J. Wysocki if (genpd->sd_count > 0) 256f721889fSRafael J. Wysocki return -EBUSY; 257f721889fSRafael J. Wysocki 258f721889fSRafael J. Wysocki not_suspended = 0; 259f721889fSRafael J. Wysocki list_for_each_entry(dle, &genpd->dev_list, node) 260f721889fSRafael J. Wysocki if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) 261f721889fSRafael J. Wysocki not_suspended++; 262f721889fSRafael J. Wysocki 263f721889fSRafael J. Wysocki if (not_suspended > genpd->in_progress) 264f721889fSRafael J. Wysocki return -EBUSY; 265f721889fSRafael J. Wysocki 266c6d22b37SRafael J. Wysocki if (genpd->poweroff_task) { 267c6d22b37SRafael J. Wysocki /* 268c6d22b37SRafael J. Wysocki * Another instance of pm_genpd_poweroff() is executing 269c6d22b37SRafael J. Wysocki * callbacks, so tell it to start over and return. 270c6d22b37SRafael J. Wysocki */ 271c6d22b37SRafael J. Wysocki genpd->status = GPD_STATE_REPEAT; 272c6d22b37SRafael J. Wysocki return 0; 273c6d22b37SRafael J. Wysocki } 274c6d22b37SRafael J. Wysocki 275f721889fSRafael J. Wysocki if (genpd->gov && genpd->gov->power_down_ok) { 276f721889fSRafael J. Wysocki if (!genpd->gov->power_down_ok(&genpd->domain)) 277f721889fSRafael J. Wysocki return -EAGAIN; 278f721889fSRafael J. Wysocki } 279f721889fSRafael J. Wysocki 28017b75ecaSRafael J. Wysocki genpd->status = GPD_STATE_BUSY; 281c6d22b37SRafael J. Wysocki genpd->poweroff_task = current; 28217b75ecaSRafael J. Wysocki 283f721889fSRafael J. Wysocki list_for_each_entry_reverse(dle, &genpd->dev_list, node) { 284f721889fSRafael J. Wysocki ret = __pm_genpd_save_device(dle, genpd); 285697a7f37SRafael J. Wysocki if (ret) { 286697a7f37SRafael J. Wysocki genpd_set_active(genpd); 287697a7f37SRafael J. Wysocki goto out; 288697a7f37SRafael J. Wysocki } 289f721889fSRafael J. Wysocki 290c6d22b37SRafael J. Wysocki if (genpd_abort_poweroff(genpd)) 291c6d22b37SRafael J. Wysocki goto out; 292c6d22b37SRafael J. Wysocki 293c6d22b37SRafael J. Wysocki if (genpd->status == GPD_STATE_REPEAT) { 294c6d22b37SRafael J. Wysocki genpd->poweroff_task = NULL; 295c6d22b37SRafael J. Wysocki goto start; 296c6d22b37SRafael J. Wysocki } 297c6d22b37SRafael J. Wysocki } 29817b75ecaSRafael J. Wysocki 29917b75ecaSRafael J. Wysocki parent = genpd->parent; 30017b75ecaSRafael J. Wysocki if (parent) { 301c6d22b37SRafael J. Wysocki mutex_unlock(&genpd->lock); 302c6d22b37SRafael J. Wysocki 30317b75ecaSRafael J. Wysocki genpd_acquire_lock(parent); 30417b75ecaSRafael J. Wysocki mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); 305c6d22b37SRafael J. Wysocki 306c6d22b37SRafael J. Wysocki if (genpd_abort_poweroff(genpd)) { 307c6d22b37SRafael J. Wysocki genpd_release_lock(parent); 308c6d22b37SRafael J. Wysocki goto out; 309c6d22b37SRafael J. Wysocki } 31017b75ecaSRafael J. Wysocki } 31117b75ecaSRafael J. Wysocki 312f721889fSRafael J. Wysocki if (genpd->power_off) 313f721889fSRafael J. Wysocki genpd->power_off(genpd); 314f721889fSRafael J. Wysocki 31517b75ecaSRafael J. Wysocki genpd->status = GPD_STATE_POWER_OFF; 316f721889fSRafael J. Wysocki 317f721889fSRafael J. Wysocki if (parent) { 318f721889fSRafael J. Wysocki genpd_sd_counter_dec(parent); 319f721889fSRafael J. Wysocki if (parent->sd_count == 0) 32056375fd4SRafael J. Wysocki genpd_queue_power_off_work(parent); 32117b75ecaSRafael J. Wysocki 32217b75ecaSRafael J. Wysocki genpd_release_lock(parent); 323f721889fSRafael J. Wysocki } 324f721889fSRafael J. Wysocki 325c6d22b37SRafael J. Wysocki out: 326c6d22b37SRafael J. Wysocki genpd->poweroff_task = NULL; 327c6d22b37SRafael J. Wysocki wake_up_all(&genpd->status_wait_queue); 328c6d22b37SRafael J. Wysocki return ret; 329f721889fSRafael J. Wysocki } 330f721889fSRafael J. Wysocki 331f721889fSRafael J. Wysocki /** 332f721889fSRafael J. Wysocki * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. 333f721889fSRafael J. Wysocki * @work: Work structure used for scheduling the execution of this function. 334f721889fSRafael J. Wysocki */ 335f721889fSRafael J. Wysocki static void genpd_power_off_work_fn(struct work_struct *work) 336f721889fSRafael J. Wysocki { 337f721889fSRafael J. Wysocki struct generic_pm_domain *genpd; 338f721889fSRafael J. Wysocki 339f721889fSRafael J. Wysocki genpd = container_of(work, struct generic_pm_domain, power_off_work); 340f721889fSRafael J. Wysocki 34117b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 342f721889fSRafael J. Wysocki pm_genpd_poweroff(genpd); 34317b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 344f721889fSRafael J. Wysocki } 345f721889fSRafael J. Wysocki 346f721889fSRafael J. Wysocki /** 347f721889fSRafael J. Wysocki * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. 348f721889fSRafael J. Wysocki * @dev: Device to suspend. 349f721889fSRafael J. Wysocki * 350f721889fSRafael J. Wysocki * Carry out a runtime suspend of a device under the assumption that its 351f721889fSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 352f721889fSRafael J. Wysocki * struct generic_pm_domain representing a PM domain consisting of I/O devices. 353f721889fSRafael J. Wysocki */ 354f721889fSRafael J. Wysocki static int pm_genpd_runtime_suspend(struct device *dev) 355f721889fSRafael J. Wysocki { 356f721889fSRafael J. Wysocki struct generic_pm_domain *genpd; 357f721889fSRafael J. Wysocki 358f721889fSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 359f721889fSRafael J. Wysocki 3605248051bSRafael J. Wysocki genpd = dev_to_genpd(dev); 3615248051bSRafael J. Wysocki if (IS_ERR(genpd)) 362f721889fSRafael J. Wysocki return -EINVAL; 363f721889fSRafael J. Wysocki 364f721889fSRafael J. Wysocki if (genpd->stop_device) { 365f721889fSRafael J. Wysocki int ret = genpd->stop_device(dev); 366f721889fSRafael J. Wysocki if (ret) 36717b75ecaSRafael J. Wysocki return ret; 368f721889fSRafael J. Wysocki } 36917b75ecaSRafael J. Wysocki 370c6d22b37SRafael J. Wysocki mutex_lock(&genpd->lock); 371f721889fSRafael J. Wysocki genpd->in_progress++; 372f721889fSRafael J. Wysocki pm_genpd_poweroff(genpd); 373f721889fSRafael J. Wysocki genpd->in_progress--; 374c6d22b37SRafael J. Wysocki mutex_unlock(&genpd->lock); 375f721889fSRafael J. Wysocki 376f721889fSRafael J. Wysocki return 0; 377f721889fSRafael J. Wysocki } 378f721889fSRafael J. Wysocki 379f721889fSRafael J. Wysocki /** 380596ba34bSRafael J. Wysocki * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. 381596ba34bSRafael J. Wysocki * @dev: Device to resume. 382596ba34bSRafael J. Wysocki * @genpd: PM domain the device belongs to. 383596ba34bSRafael J. Wysocki */ 384596ba34bSRafael J. Wysocki static void __pm_genpd_runtime_resume(struct device *dev, 385596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd) 386596ba34bSRafael J. Wysocki { 387596ba34bSRafael J. Wysocki struct dev_list_entry *dle; 388596ba34bSRafael J. Wysocki 389596ba34bSRafael J. Wysocki list_for_each_entry(dle, &genpd->dev_list, node) { 390596ba34bSRafael J. Wysocki if (dle->dev == dev) { 391596ba34bSRafael J. Wysocki __pm_genpd_restore_device(dle, genpd); 392596ba34bSRafael J. Wysocki break; 393596ba34bSRafael J. Wysocki } 394596ba34bSRafael J. Wysocki } 395596ba34bSRafael J. Wysocki } 396596ba34bSRafael J. Wysocki 397596ba34bSRafael J. Wysocki /** 398f721889fSRafael J. Wysocki * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. 399f721889fSRafael J. Wysocki * @dev: Device to resume. 400f721889fSRafael J. Wysocki * 401f721889fSRafael J. Wysocki * Carry out a runtime resume of a device under the assumption that its 402f721889fSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 403f721889fSRafael J. Wysocki * struct generic_pm_domain representing a PM domain consisting of I/O devices. 404f721889fSRafael J. Wysocki */ 405f721889fSRafael J. Wysocki static int pm_genpd_runtime_resume(struct device *dev) 406f721889fSRafael J. Wysocki { 407f721889fSRafael J. Wysocki struct generic_pm_domain *genpd; 408c6d22b37SRafael J. Wysocki DEFINE_WAIT(wait); 409f721889fSRafael J. Wysocki int ret; 410f721889fSRafael J. Wysocki 411f721889fSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 412f721889fSRafael J. Wysocki 4135248051bSRafael J. Wysocki genpd = dev_to_genpd(dev); 4145248051bSRafael J. Wysocki if (IS_ERR(genpd)) 415f721889fSRafael J. Wysocki return -EINVAL; 416f721889fSRafael J. Wysocki 417f721889fSRafael J. Wysocki ret = pm_genpd_poweron(genpd); 418f721889fSRafael J. Wysocki if (ret) 419f721889fSRafael J. Wysocki return ret; 420f721889fSRafael J. Wysocki 421c6d22b37SRafael J. Wysocki mutex_lock(&genpd->lock); 42217b75ecaSRafael J. Wysocki genpd->status = GPD_STATE_BUSY; 423c6d22b37SRafael J. Wysocki genpd->resume_count++; 424c6d22b37SRafael J. Wysocki for (;;) { 425c6d22b37SRafael J. Wysocki prepare_to_wait(&genpd->status_wait_queue, &wait, 426c6d22b37SRafael J. Wysocki TASK_UNINTERRUPTIBLE); 427c6d22b37SRafael J. Wysocki /* 428c6d22b37SRafael J. Wysocki * If current is the powering off task, we have been called 429c6d22b37SRafael J. Wysocki * reentrantly from one of the device callbacks, so we should 430c6d22b37SRafael J. Wysocki * not wait. 431c6d22b37SRafael J. Wysocki */ 432c6d22b37SRafael J. Wysocki if (!genpd->poweroff_task || genpd->poweroff_task == current) 433c6d22b37SRafael J. Wysocki break; 434c6d22b37SRafael J. Wysocki mutex_unlock(&genpd->lock); 435c6d22b37SRafael J. Wysocki 436c6d22b37SRafael J. Wysocki schedule(); 437c6d22b37SRafael J. Wysocki 438c6d22b37SRafael J. Wysocki mutex_lock(&genpd->lock); 439c6d22b37SRafael J. Wysocki } 440c6d22b37SRafael J. Wysocki finish_wait(&genpd->status_wait_queue, &wait); 441596ba34bSRafael J. Wysocki __pm_genpd_runtime_resume(dev, genpd); 442c6d22b37SRafael J. Wysocki genpd->resume_count--; 443c6d22b37SRafael J. Wysocki genpd_set_active(genpd); 44417b75ecaSRafael J. Wysocki wake_up_all(&genpd->status_wait_queue); 445c6d22b37SRafael J. Wysocki mutex_unlock(&genpd->lock); 44617b75ecaSRafael J. Wysocki 44717b75ecaSRafael J. Wysocki if (genpd->start_device) 44817b75ecaSRafael J. Wysocki genpd->start_device(dev); 449f721889fSRafael J. Wysocki 450f721889fSRafael J. Wysocki return 0; 451f721889fSRafael J. Wysocki } 452f721889fSRafael J. Wysocki 453f721889fSRafael J. Wysocki #else 454f721889fSRafael J. Wysocki 455f721889fSRafael J. Wysocki static inline void genpd_power_off_work_fn(struct work_struct *work) {} 456596ba34bSRafael J. Wysocki static inline void __pm_genpd_runtime_resume(struct device *dev, 457596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd) {} 458f721889fSRafael J. Wysocki 459f721889fSRafael J. Wysocki #define pm_genpd_runtime_suspend NULL 460f721889fSRafael J. Wysocki #define pm_genpd_runtime_resume NULL 461f721889fSRafael J. Wysocki 462f721889fSRafael J. Wysocki #endif /* CONFIG_PM_RUNTIME */ 463f721889fSRafael J. Wysocki 464596ba34bSRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 465596ba34bSRafael J. Wysocki 466596ba34bSRafael J. Wysocki /** 467596ba34bSRafael J. Wysocki * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. 468596ba34bSRafael J. Wysocki * @genpd: PM domain to power off, if possible. 469596ba34bSRafael J. Wysocki * 470596ba34bSRafael J. Wysocki * Check if the given PM domain can be powered off (during system suspend or 471596ba34bSRafael J. Wysocki * hibernation) and do that if so. Also, in that case propagate to its parent. 472596ba34bSRafael J. Wysocki * 473596ba34bSRafael J. Wysocki * This function is only called in "noirq" stages of system power transitions, 474596ba34bSRafael J. Wysocki * so it need not acquire locks (all of the "noirq" callbacks are executed 475596ba34bSRafael J. Wysocki * sequentially, so it is guaranteed that it will never run twice in parallel). 476596ba34bSRafael J. Wysocki */ 477596ba34bSRafael J. Wysocki static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) 478596ba34bSRafael J. Wysocki { 479596ba34bSRafael J. Wysocki struct generic_pm_domain *parent = genpd->parent; 480596ba34bSRafael J. Wysocki 48117b75ecaSRafael J. Wysocki if (genpd->status == GPD_STATE_POWER_OFF) 482596ba34bSRafael J. Wysocki return; 483596ba34bSRafael J. Wysocki 484596ba34bSRafael J. Wysocki if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) 485596ba34bSRafael J. Wysocki return; 486596ba34bSRafael J. Wysocki 487596ba34bSRafael J. Wysocki if (genpd->power_off) 488596ba34bSRafael J. Wysocki genpd->power_off(genpd); 489596ba34bSRafael J. Wysocki 49017b75ecaSRafael J. Wysocki genpd->status = GPD_STATE_POWER_OFF; 491596ba34bSRafael J. Wysocki if (parent) { 492596ba34bSRafael J. Wysocki genpd_sd_counter_dec(parent); 493596ba34bSRafael J. Wysocki pm_genpd_sync_poweroff(parent); 494596ba34bSRafael J. Wysocki } 495596ba34bSRafael J. Wysocki } 496596ba34bSRafael J. Wysocki 497596ba34bSRafael J. Wysocki /** 4984ecd6e65SRafael J. Wysocki * resume_needed - Check whether to resume a device before system suspend. 4994ecd6e65SRafael J. Wysocki * @dev: Device to check. 5004ecd6e65SRafael J. Wysocki * @genpd: PM domain the device belongs to. 5014ecd6e65SRafael J. Wysocki * 5024ecd6e65SRafael J. Wysocki * There are two cases in which a device that can wake up the system from sleep 5034ecd6e65SRafael J. Wysocki * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled 5044ecd6e65SRafael J. Wysocki * to wake up the system and it has to remain active for this purpose while the 5054ecd6e65SRafael J. Wysocki * system is in the sleep state and (2) if the device is not enabled to wake up 5064ecd6e65SRafael J. Wysocki * the system from sleep states and it generally doesn't generate wakeup signals 5074ecd6e65SRafael J. Wysocki * by itself (those signals are generated on its behalf by other parts of the 5084ecd6e65SRafael J. Wysocki * system). In the latter case it may be necessary to reconfigure the device's 5094ecd6e65SRafael J. Wysocki * wakeup settings during system suspend, because it may have been set up to 5104ecd6e65SRafael J. Wysocki * signal remote wakeup from the system's working state as needed by runtime PM. 5114ecd6e65SRafael J. Wysocki * Return 'true' in either of the above cases. 5124ecd6e65SRafael J. Wysocki */ 5134ecd6e65SRafael J. Wysocki static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) 5144ecd6e65SRafael J. Wysocki { 5154ecd6e65SRafael J. Wysocki bool active_wakeup; 5164ecd6e65SRafael J. Wysocki 5174ecd6e65SRafael J. Wysocki if (!device_can_wakeup(dev)) 5184ecd6e65SRafael J. Wysocki return false; 5194ecd6e65SRafael J. Wysocki 5204ecd6e65SRafael J. Wysocki active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); 5214ecd6e65SRafael J. Wysocki return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; 5224ecd6e65SRafael J. Wysocki } 5234ecd6e65SRafael J. Wysocki 5244ecd6e65SRafael J. Wysocki /** 525596ba34bSRafael J. Wysocki * pm_genpd_prepare - Start power transition of a device in a PM domain. 526596ba34bSRafael J. Wysocki * @dev: Device to start the transition of. 527596ba34bSRafael J. Wysocki * 528596ba34bSRafael J. Wysocki * Start a power transition of a device (during a system-wide power transition) 529596ba34bSRafael J. Wysocki * under the assumption that its pm_domain field points to the domain member of 530596ba34bSRafael J. Wysocki * an object of type struct generic_pm_domain representing a PM domain 531596ba34bSRafael J. Wysocki * consisting of I/O devices. 532596ba34bSRafael J. Wysocki */ 533596ba34bSRafael J. Wysocki static int pm_genpd_prepare(struct device *dev) 534596ba34bSRafael J. Wysocki { 535596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 536b6c10c84SRafael J. Wysocki int ret; 537596ba34bSRafael J. Wysocki 538596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 539596ba34bSRafael J. Wysocki 540596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 541596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 542596ba34bSRafael J. Wysocki return -EINVAL; 543596ba34bSRafael J. Wysocki 54417b75ecaSRafael J. Wysocki /* 54517b75ecaSRafael J. Wysocki * If a wakeup request is pending for the device, it should be woken up 54617b75ecaSRafael J. Wysocki * at this point and a system wakeup event should be reported if it's 54717b75ecaSRafael J. Wysocki * set up to wake up the system from sleep states. 54817b75ecaSRafael J. Wysocki */ 54917b75ecaSRafael J. Wysocki pm_runtime_get_noresume(dev); 55017b75ecaSRafael J. Wysocki if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) 55117b75ecaSRafael J. Wysocki pm_wakeup_event(dev, 0); 55217b75ecaSRafael J. Wysocki 55317b75ecaSRafael J. Wysocki if (pm_wakeup_pending()) { 55417b75ecaSRafael J. Wysocki pm_runtime_put_sync(dev); 55517b75ecaSRafael J. Wysocki return -EBUSY; 55617b75ecaSRafael J. Wysocki } 55717b75ecaSRafael J. Wysocki 5584ecd6e65SRafael J. Wysocki if (resume_needed(dev, genpd)) 5594ecd6e65SRafael J. Wysocki pm_runtime_resume(dev); 5604ecd6e65SRafael J. Wysocki 56117b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 562596ba34bSRafael J. Wysocki 563596ba34bSRafael J. Wysocki if (genpd->prepared_count++ == 0) 56417b75ecaSRafael J. Wysocki genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; 56517b75ecaSRafael J. Wysocki 56617b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 567596ba34bSRafael J. Wysocki 568596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) { 56917b75ecaSRafael J. Wysocki pm_runtime_put_noidle(dev); 570596ba34bSRafael J. Wysocki return 0; 571596ba34bSRafael J. Wysocki } 572596ba34bSRafael J. Wysocki 573596ba34bSRafael J. Wysocki /* 57417b75ecaSRafael J. Wysocki * The PM domain must be in the GPD_STATE_ACTIVE state at this point, 57517b75ecaSRafael J. Wysocki * so pm_genpd_poweron() will return immediately, but if the device 57617b75ecaSRafael J. Wysocki * is suspended (e.g. it's been stopped by .stop_device()), we need 57717b75ecaSRafael J. Wysocki * to make it operational. 578596ba34bSRafael J. Wysocki */ 57917b75ecaSRafael J. Wysocki pm_runtime_resume(dev); 580596ba34bSRafael J. Wysocki __pm_runtime_disable(dev, false); 581596ba34bSRafael J. Wysocki 582b6c10c84SRafael J. Wysocki ret = pm_generic_prepare(dev); 583b6c10c84SRafael J. Wysocki if (ret) { 584b6c10c84SRafael J. Wysocki mutex_lock(&genpd->lock); 585b6c10c84SRafael J. Wysocki 586b6c10c84SRafael J. Wysocki if (--genpd->prepared_count == 0) 587b6c10c84SRafael J. Wysocki genpd->suspend_power_off = false; 588b6c10c84SRafael J. Wysocki 589b6c10c84SRafael J. Wysocki mutex_unlock(&genpd->lock); 59017b75ecaSRafael J. Wysocki pm_runtime_enable(dev); 591b6c10c84SRafael J. Wysocki } 59217b75ecaSRafael J. Wysocki 59317b75ecaSRafael J. Wysocki pm_runtime_put_sync(dev); 594b6c10c84SRafael J. Wysocki return ret; 595596ba34bSRafael J. Wysocki } 596596ba34bSRafael J. Wysocki 597596ba34bSRafael J. Wysocki /** 598596ba34bSRafael J. Wysocki * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. 599596ba34bSRafael J. Wysocki * @dev: Device to suspend. 600596ba34bSRafael J. Wysocki * 601596ba34bSRafael J. Wysocki * Suspend a device under the assumption that its pm_domain field points to the 602596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 603596ba34bSRafael J. Wysocki * a PM domain consisting of I/O devices. 604596ba34bSRafael J. Wysocki */ 605596ba34bSRafael J. Wysocki static int pm_genpd_suspend(struct device *dev) 606596ba34bSRafael J. Wysocki { 607596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 608596ba34bSRafael J. Wysocki 609596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 610596ba34bSRafael J. Wysocki 611596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 612596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 613596ba34bSRafael J. Wysocki return -EINVAL; 614596ba34bSRafael J. Wysocki 615596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); 616596ba34bSRafael J. Wysocki } 617596ba34bSRafael J. Wysocki 618596ba34bSRafael J. Wysocki /** 619596ba34bSRafael J. Wysocki * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. 620596ba34bSRafael J. Wysocki * @dev: Device to suspend. 621596ba34bSRafael J. Wysocki * 622596ba34bSRafael J. Wysocki * Carry out a late suspend of a device under the assumption that its 623596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 624596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a PM domain consisting of I/O devices. 625596ba34bSRafael J. Wysocki */ 626596ba34bSRafael J. Wysocki static int pm_genpd_suspend_noirq(struct device *dev) 627596ba34bSRafael J. Wysocki { 628596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 629596ba34bSRafael J. Wysocki int ret; 630596ba34bSRafael J. Wysocki 631596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 632596ba34bSRafael J. Wysocki 633596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 634596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 635596ba34bSRafael J. Wysocki return -EINVAL; 636596ba34bSRafael J. Wysocki 637596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) 638596ba34bSRafael J. Wysocki return 0; 639596ba34bSRafael J. Wysocki 640596ba34bSRafael J. Wysocki ret = pm_generic_suspend_noirq(dev); 641596ba34bSRafael J. Wysocki if (ret) 642596ba34bSRafael J. Wysocki return ret; 643596ba34bSRafael J. Wysocki 644d4f2d87aSRafael J. Wysocki if (device_may_wakeup(dev) 645d4f2d87aSRafael J. Wysocki && genpd->active_wakeup && genpd->active_wakeup(dev)) 646d4f2d87aSRafael J. Wysocki return 0; 647d4f2d87aSRafael J. Wysocki 648596ba34bSRafael J. Wysocki if (genpd->stop_device) 649596ba34bSRafael J. Wysocki genpd->stop_device(dev); 650596ba34bSRafael J. Wysocki 651596ba34bSRafael J. Wysocki /* 652596ba34bSRafael J. Wysocki * Since all of the "noirq" callbacks are executed sequentially, it is 653596ba34bSRafael J. Wysocki * guaranteed that this function will never run twice in parallel for 654596ba34bSRafael J. Wysocki * the same PM domain, so it is not necessary to use locking here. 655596ba34bSRafael J. Wysocki */ 656596ba34bSRafael J. Wysocki genpd->suspended_count++; 657596ba34bSRafael J. Wysocki pm_genpd_sync_poweroff(genpd); 658596ba34bSRafael J. Wysocki 659596ba34bSRafael J. Wysocki return 0; 660596ba34bSRafael J. Wysocki } 661596ba34bSRafael J. Wysocki 662596ba34bSRafael J. Wysocki /** 663596ba34bSRafael J. Wysocki * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. 664596ba34bSRafael J. Wysocki * @dev: Device to resume. 665596ba34bSRafael J. Wysocki * 666596ba34bSRafael J. Wysocki * Carry out an early resume of a device under the assumption that its 667596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 668596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a power domain consisting of I/O 669596ba34bSRafael J. Wysocki * devices. 670596ba34bSRafael J. Wysocki */ 671596ba34bSRafael J. Wysocki static int pm_genpd_resume_noirq(struct device *dev) 672596ba34bSRafael J. Wysocki { 673596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 674596ba34bSRafael J. Wysocki 675596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 676596ba34bSRafael J. Wysocki 677596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 678596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 679596ba34bSRafael J. Wysocki return -EINVAL; 680596ba34bSRafael J. Wysocki 681596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) 682596ba34bSRafael J. Wysocki return 0; 683596ba34bSRafael J. Wysocki 684596ba34bSRafael J. Wysocki /* 685596ba34bSRafael J. Wysocki * Since all of the "noirq" callbacks are executed sequentially, it is 686596ba34bSRafael J. Wysocki * guaranteed that this function will never run twice in parallel for 687596ba34bSRafael J. Wysocki * the same PM domain, so it is not necessary to use locking here. 688596ba34bSRafael J. Wysocki */ 689596ba34bSRafael J. Wysocki pm_genpd_poweron(genpd); 690596ba34bSRafael J. Wysocki genpd->suspended_count--; 691596ba34bSRafael J. Wysocki if (genpd->start_device) 692596ba34bSRafael J. Wysocki genpd->start_device(dev); 693596ba34bSRafael J. Wysocki 694596ba34bSRafael J. Wysocki return pm_generic_resume_noirq(dev); 695596ba34bSRafael J. Wysocki } 696596ba34bSRafael J. Wysocki 697596ba34bSRafael J. Wysocki /** 698596ba34bSRafael J. Wysocki * pm_genpd_resume - Resume a device belonging to an I/O power domain. 699596ba34bSRafael J. Wysocki * @dev: Device to resume. 700596ba34bSRafael J. Wysocki * 701596ba34bSRafael J. Wysocki * Resume a device under the assumption that its pm_domain field points to the 702596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 703596ba34bSRafael J. Wysocki * a power domain consisting of I/O devices. 704596ba34bSRafael J. Wysocki */ 705596ba34bSRafael J. Wysocki static int pm_genpd_resume(struct device *dev) 706596ba34bSRafael J. Wysocki { 707596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 708596ba34bSRafael J. Wysocki 709596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 710596ba34bSRafael J. Wysocki 711596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 712596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 713596ba34bSRafael J. Wysocki return -EINVAL; 714596ba34bSRafael J. Wysocki 715596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); 716596ba34bSRafael J. Wysocki } 717596ba34bSRafael J. Wysocki 718596ba34bSRafael J. Wysocki /** 719596ba34bSRafael J. Wysocki * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. 720596ba34bSRafael J. Wysocki * @dev: Device to freeze. 721596ba34bSRafael J. Wysocki * 722596ba34bSRafael J. Wysocki * Freeze a device under the assumption that its pm_domain field points to the 723596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 724596ba34bSRafael J. Wysocki * a power domain consisting of I/O devices. 725596ba34bSRafael J. Wysocki */ 726596ba34bSRafael J. Wysocki static int pm_genpd_freeze(struct device *dev) 727596ba34bSRafael J. Wysocki { 728596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 729596ba34bSRafael J. Wysocki 730596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 731596ba34bSRafael J. Wysocki 732596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 733596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 734596ba34bSRafael J. Wysocki return -EINVAL; 735596ba34bSRafael J. Wysocki 736596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); 737596ba34bSRafael J. Wysocki } 738596ba34bSRafael J. Wysocki 739596ba34bSRafael J. Wysocki /** 740596ba34bSRafael J. Wysocki * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. 741596ba34bSRafael J. Wysocki * @dev: Device to freeze. 742596ba34bSRafael J. Wysocki * 743596ba34bSRafael J. Wysocki * Carry out a late freeze of a device under the assumption that its 744596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 745596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a power domain consisting of I/O 746596ba34bSRafael J. Wysocki * devices. 747596ba34bSRafael J. Wysocki */ 748596ba34bSRafael J. Wysocki static int pm_genpd_freeze_noirq(struct device *dev) 749596ba34bSRafael J. Wysocki { 750596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 751596ba34bSRafael J. Wysocki int ret; 752596ba34bSRafael J. Wysocki 753596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 754596ba34bSRafael J. Wysocki 755596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 756596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 757596ba34bSRafael J. Wysocki return -EINVAL; 758596ba34bSRafael J. Wysocki 759596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) 760596ba34bSRafael J. Wysocki return 0; 761596ba34bSRafael J. Wysocki 762596ba34bSRafael J. Wysocki ret = pm_generic_freeze_noirq(dev); 763596ba34bSRafael J. Wysocki if (ret) 764596ba34bSRafael J. Wysocki return ret; 765596ba34bSRafael J. Wysocki 766596ba34bSRafael J. Wysocki if (genpd->stop_device) 767596ba34bSRafael J. Wysocki genpd->stop_device(dev); 768596ba34bSRafael J. Wysocki 769596ba34bSRafael J. Wysocki return 0; 770596ba34bSRafael J. Wysocki } 771596ba34bSRafael J. Wysocki 772596ba34bSRafael J. Wysocki /** 773596ba34bSRafael J. Wysocki * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. 774596ba34bSRafael J. Wysocki * @dev: Device to thaw. 775596ba34bSRafael J. Wysocki * 776596ba34bSRafael J. Wysocki * Carry out an early thaw of a device under the assumption that its 777596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 778596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a power domain consisting of I/O 779596ba34bSRafael J. Wysocki * devices. 780596ba34bSRafael J. Wysocki */ 781596ba34bSRafael J. Wysocki static int pm_genpd_thaw_noirq(struct device *dev) 782596ba34bSRafael J. Wysocki { 783596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 784596ba34bSRafael J. Wysocki 785596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 786596ba34bSRafael J. Wysocki 787596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 788596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 789596ba34bSRafael J. Wysocki return -EINVAL; 790596ba34bSRafael J. Wysocki 791596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) 792596ba34bSRafael J. Wysocki return 0; 793596ba34bSRafael J. Wysocki 794596ba34bSRafael J. Wysocki if (genpd->start_device) 795596ba34bSRafael J. Wysocki genpd->start_device(dev); 796596ba34bSRafael J. Wysocki 797596ba34bSRafael J. Wysocki return pm_generic_thaw_noirq(dev); 798596ba34bSRafael J. Wysocki } 799596ba34bSRafael J. Wysocki 800596ba34bSRafael J. Wysocki /** 801596ba34bSRafael J. Wysocki * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. 802596ba34bSRafael J. Wysocki * @dev: Device to thaw. 803596ba34bSRafael J. Wysocki * 804596ba34bSRafael J. Wysocki * Thaw a device under the assumption that its pm_domain field points to the 805596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 806596ba34bSRafael J. Wysocki * a power domain consisting of I/O devices. 807596ba34bSRafael J. Wysocki */ 808596ba34bSRafael J. Wysocki static int pm_genpd_thaw(struct device *dev) 809596ba34bSRafael J. Wysocki { 810596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 811596ba34bSRafael J. Wysocki 812596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 813596ba34bSRafael J. Wysocki 814596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 815596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 816596ba34bSRafael J. Wysocki return -EINVAL; 817596ba34bSRafael J. Wysocki 818596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); 819596ba34bSRafael J. Wysocki } 820596ba34bSRafael J. Wysocki 821596ba34bSRafael J. Wysocki /** 822596ba34bSRafael J. Wysocki * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. 823596ba34bSRafael J. Wysocki * @dev: Device to suspend. 824596ba34bSRafael J. Wysocki * 825596ba34bSRafael J. Wysocki * Power off a device under the assumption that its pm_domain field points to 826596ba34bSRafael J. Wysocki * the domain member of an object of type struct generic_pm_domain representing 827596ba34bSRafael J. Wysocki * a PM domain consisting of I/O devices. 828596ba34bSRafael J. Wysocki */ 829596ba34bSRafael J. Wysocki static int pm_genpd_dev_poweroff(struct device *dev) 830596ba34bSRafael J. Wysocki { 831596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 832596ba34bSRafael J. Wysocki 833596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 834596ba34bSRafael J. Wysocki 835596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 836596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 837596ba34bSRafael J. Wysocki return -EINVAL; 838596ba34bSRafael J. Wysocki 839596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); 840596ba34bSRafael J. Wysocki } 841596ba34bSRafael J. Wysocki 842596ba34bSRafael J. Wysocki /** 843596ba34bSRafael J. Wysocki * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. 844596ba34bSRafael J. Wysocki * @dev: Device to suspend. 845596ba34bSRafael J. Wysocki * 846596ba34bSRafael J. Wysocki * Carry out a late powering off of a device under the assumption that its 847596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 848596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a PM domain consisting of I/O devices. 849596ba34bSRafael J. Wysocki */ 850596ba34bSRafael J. Wysocki static int pm_genpd_dev_poweroff_noirq(struct device *dev) 851596ba34bSRafael J. Wysocki { 852596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 853596ba34bSRafael J. Wysocki int ret; 854596ba34bSRafael J. Wysocki 855596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 856596ba34bSRafael J. Wysocki 857596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 858596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 859596ba34bSRafael J. Wysocki return -EINVAL; 860596ba34bSRafael J. Wysocki 861596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) 862596ba34bSRafael J. Wysocki return 0; 863596ba34bSRafael J. Wysocki 864596ba34bSRafael J. Wysocki ret = pm_generic_poweroff_noirq(dev); 865596ba34bSRafael J. Wysocki if (ret) 866596ba34bSRafael J. Wysocki return ret; 867596ba34bSRafael J. Wysocki 868d4f2d87aSRafael J. Wysocki if (device_may_wakeup(dev) 869d4f2d87aSRafael J. Wysocki && genpd->active_wakeup && genpd->active_wakeup(dev)) 870d4f2d87aSRafael J. Wysocki return 0; 871d4f2d87aSRafael J. Wysocki 872596ba34bSRafael J. Wysocki if (genpd->stop_device) 873596ba34bSRafael J. Wysocki genpd->stop_device(dev); 874596ba34bSRafael J. Wysocki 875596ba34bSRafael J. Wysocki /* 876596ba34bSRafael J. Wysocki * Since all of the "noirq" callbacks are executed sequentially, it is 877596ba34bSRafael J. Wysocki * guaranteed that this function will never run twice in parallel for 878596ba34bSRafael J. Wysocki * the same PM domain, so it is not necessary to use locking here. 879596ba34bSRafael J. Wysocki */ 880596ba34bSRafael J. Wysocki genpd->suspended_count++; 881596ba34bSRafael J. Wysocki pm_genpd_sync_poweroff(genpd); 882596ba34bSRafael J. Wysocki 883596ba34bSRafael J. Wysocki return 0; 884596ba34bSRafael J. Wysocki } 885596ba34bSRafael J. Wysocki 886596ba34bSRafael J. Wysocki /** 887596ba34bSRafael J. Wysocki * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. 888596ba34bSRafael J. Wysocki * @dev: Device to resume. 889596ba34bSRafael J. Wysocki * 890596ba34bSRafael J. Wysocki * Carry out an early restore of a device under the assumption that its 891596ba34bSRafael J. Wysocki * pm_domain field points to the domain member of an object of type 892596ba34bSRafael J. Wysocki * struct generic_pm_domain representing a power domain consisting of I/O 893596ba34bSRafael J. Wysocki * devices. 894596ba34bSRafael J. Wysocki */ 895596ba34bSRafael J. Wysocki static int pm_genpd_restore_noirq(struct device *dev) 896596ba34bSRafael J. Wysocki { 897596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 898596ba34bSRafael J. Wysocki 899596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 900596ba34bSRafael J. Wysocki 901596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 902596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 903596ba34bSRafael J. Wysocki return -EINVAL; 904596ba34bSRafael J. Wysocki 905596ba34bSRafael J. Wysocki /* 906596ba34bSRafael J. Wysocki * Since all of the "noirq" callbacks are executed sequentially, it is 907596ba34bSRafael J. Wysocki * guaranteed that this function will never run twice in parallel for 908596ba34bSRafael J. Wysocki * the same PM domain, so it is not necessary to use locking here. 909596ba34bSRafael J. Wysocki */ 91017b75ecaSRafael J. Wysocki genpd->status = GPD_STATE_POWER_OFF; 911596ba34bSRafael J. Wysocki if (genpd->suspend_power_off) { 912596ba34bSRafael J. Wysocki /* 913596ba34bSRafael J. Wysocki * The boot kernel might put the domain into the power on state, 914596ba34bSRafael J. Wysocki * so make sure it really is powered off. 915596ba34bSRafael J. Wysocki */ 916596ba34bSRafael J. Wysocki if (genpd->power_off) 917596ba34bSRafael J. Wysocki genpd->power_off(genpd); 918596ba34bSRafael J. Wysocki return 0; 919596ba34bSRafael J. Wysocki } 920596ba34bSRafael J. Wysocki 921596ba34bSRafael J. Wysocki pm_genpd_poweron(genpd); 922596ba34bSRafael J. Wysocki genpd->suspended_count--; 923596ba34bSRafael J. Wysocki if (genpd->start_device) 924596ba34bSRafael J. Wysocki genpd->start_device(dev); 925596ba34bSRafael J. Wysocki 926596ba34bSRafael J. Wysocki return pm_generic_restore_noirq(dev); 927596ba34bSRafael J. Wysocki } 928596ba34bSRafael J. Wysocki 929596ba34bSRafael J. Wysocki /** 930596ba34bSRafael J. Wysocki * pm_genpd_restore - Restore a device belonging to an I/O power domain. 931596ba34bSRafael J. Wysocki * @dev: Device to resume. 932596ba34bSRafael J. Wysocki * 933596ba34bSRafael J. Wysocki * Restore a device under the assumption that its pm_domain field points to the 934596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 935596ba34bSRafael J. Wysocki * a power domain consisting of I/O devices. 936596ba34bSRafael J. Wysocki */ 937596ba34bSRafael J. Wysocki static int pm_genpd_restore(struct device *dev) 938596ba34bSRafael J. Wysocki { 939596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 940596ba34bSRafael J. Wysocki 941596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 942596ba34bSRafael J. Wysocki 943596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 944596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 945596ba34bSRafael J. Wysocki return -EINVAL; 946596ba34bSRafael J. Wysocki 947596ba34bSRafael J. Wysocki return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); 948596ba34bSRafael J. Wysocki } 949596ba34bSRafael J. Wysocki 950596ba34bSRafael J. Wysocki /** 951596ba34bSRafael J. Wysocki * pm_genpd_complete - Complete power transition of a device in a power domain. 952596ba34bSRafael J. Wysocki * @dev: Device to complete the transition of. 953596ba34bSRafael J. Wysocki * 954596ba34bSRafael J. Wysocki * Complete a power transition of a device (during a system-wide power 955596ba34bSRafael J. Wysocki * transition) under the assumption that its pm_domain field points to the 956596ba34bSRafael J. Wysocki * domain member of an object of type struct generic_pm_domain representing 957596ba34bSRafael J. Wysocki * a power domain consisting of I/O devices. 958596ba34bSRafael J. Wysocki */ 959596ba34bSRafael J. Wysocki static void pm_genpd_complete(struct device *dev) 960596ba34bSRafael J. Wysocki { 961596ba34bSRafael J. Wysocki struct generic_pm_domain *genpd; 962596ba34bSRafael J. Wysocki bool run_complete; 963596ba34bSRafael J. Wysocki 964596ba34bSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 965596ba34bSRafael J. Wysocki 966596ba34bSRafael J. Wysocki genpd = dev_to_genpd(dev); 967596ba34bSRafael J. Wysocki if (IS_ERR(genpd)) 968596ba34bSRafael J. Wysocki return; 969596ba34bSRafael J. Wysocki 970596ba34bSRafael J. Wysocki mutex_lock(&genpd->lock); 971596ba34bSRafael J. Wysocki 972596ba34bSRafael J. Wysocki run_complete = !genpd->suspend_power_off; 973596ba34bSRafael J. Wysocki if (--genpd->prepared_count == 0) 974596ba34bSRafael J. Wysocki genpd->suspend_power_off = false; 975596ba34bSRafael J. Wysocki 976596ba34bSRafael J. Wysocki mutex_unlock(&genpd->lock); 977596ba34bSRafael J. Wysocki 978596ba34bSRafael J. Wysocki if (run_complete) { 979596ba34bSRafael J. Wysocki pm_generic_complete(dev); 9806f00ff78SRafael J. Wysocki pm_runtime_set_active(dev); 981596ba34bSRafael J. Wysocki pm_runtime_enable(dev); 9826f00ff78SRafael J. Wysocki pm_runtime_idle(dev); 983596ba34bSRafael J. Wysocki } 984596ba34bSRafael J. Wysocki } 985596ba34bSRafael J. Wysocki 986596ba34bSRafael J. Wysocki #else 987596ba34bSRafael J. Wysocki 988596ba34bSRafael J. Wysocki #define pm_genpd_prepare NULL 989596ba34bSRafael J. Wysocki #define pm_genpd_suspend NULL 990596ba34bSRafael J. Wysocki #define pm_genpd_suspend_noirq NULL 991596ba34bSRafael J. Wysocki #define pm_genpd_resume_noirq NULL 992596ba34bSRafael J. Wysocki #define pm_genpd_resume NULL 993596ba34bSRafael J. Wysocki #define pm_genpd_freeze NULL 994596ba34bSRafael J. Wysocki #define pm_genpd_freeze_noirq NULL 995596ba34bSRafael J. Wysocki #define pm_genpd_thaw_noirq NULL 996596ba34bSRafael J. Wysocki #define pm_genpd_thaw NULL 997596ba34bSRafael J. Wysocki #define pm_genpd_dev_poweroff_noirq NULL 998596ba34bSRafael J. Wysocki #define pm_genpd_dev_poweroff NULL 999596ba34bSRafael J. Wysocki #define pm_genpd_restore_noirq NULL 1000596ba34bSRafael J. Wysocki #define pm_genpd_restore NULL 1001596ba34bSRafael J. Wysocki #define pm_genpd_complete NULL 1002596ba34bSRafael J. Wysocki 1003596ba34bSRafael J. Wysocki #endif /* CONFIG_PM_SLEEP */ 1004596ba34bSRafael J. Wysocki 1005f721889fSRafael J. Wysocki /** 1006f721889fSRafael J. Wysocki * pm_genpd_add_device - Add a device to an I/O PM domain. 1007f721889fSRafael J. Wysocki * @genpd: PM domain to add the device to. 1008f721889fSRafael J. Wysocki * @dev: Device to be added. 1009f721889fSRafael J. Wysocki */ 1010f721889fSRafael J. Wysocki int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) 1011f721889fSRafael J. Wysocki { 1012f721889fSRafael J. Wysocki struct dev_list_entry *dle; 1013f721889fSRafael J. Wysocki int ret = 0; 1014f721889fSRafael J. Wysocki 1015f721889fSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 1016f721889fSRafael J. Wysocki 1017f721889fSRafael J. Wysocki if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) 1018f721889fSRafael J. Wysocki return -EINVAL; 1019f721889fSRafael J. Wysocki 102017b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 1021f721889fSRafael J. Wysocki 102217b75ecaSRafael J. Wysocki if (genpd->status == GPD_STATE_POWER_OFF) { 1023f721889fSRafael J. Wysocki ret = -EINVAL; 1024f721889fSRafael J. Wysocki goto out; 1025f721889fSRafael J. Wysocki } 1026f721889fSRafael J. Wysocki 1027596ba34bSRafael J. Wysocki if (genpd->prepared_count > 0) { 1028596ba34bSRafael J. Wysocki ret = -EAGAIN; 1029596ba34bSRafael J. Wysocki goto out; 1030596ba34bSRafael J. Wysocki } 1031596ba34bSRafael J. Wysocki 1032f721889fSRafael J. Wysocki list_for_each_entry(dle, &genpd->dev_list, node) 1033f721889fSRafael J. Wysocki if (dle->dev == dev) { 1034f721889fSRafael J. Wysocki ret = -EINVAL; 1035f721889fSRafael J. Wysocki goto out; 1036f721889fSRafael J. Wysocki } 1037f721889fSRafael J. Wysocki 1038f721889fSRafael J. Wysocki dle = kzalloc(sizeof(*dle), GFP_KERNEL); 1039f721889fSRafael J. Wysocki if (!dle) { 1040f721889fSRafael J. Wysocki ret = -ENOMEM; 1041f721889fSRafael J. Wysocki goto out; 1042f721889fSRafael J. Wysocki } 1043f721889fSRafael J. Wysocki 1044f721889fSRafael J. Wysocki dle->dev = dev; 1045f721889fSRafael J. Wysocki dle->need_restore = false; 1046f721889fSRafael J. Wysocki list_add_tail(&dle->node, &genpd->dev_list); 1047596ba34bSRafael J. Wysocki genpd->device_count++; 1048f721889fSRafael J. Wysocki 1049f721889fSRafael J. Wysocki spin_lock_irq(&dev->power.lock); 1050f721889fSRafael J. Wysocki dev->pm_domain = &genpd->domain; 1051f721889fSRafael J. Wysocki spin_unlock_irq(&dev->power.lock); 1052f721889fSRafael J. Wysocki 1053f721889fSRafael J. Wysocki out: 105417b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 1055f721889fSRafael J. Wysocki 1056f721889fSRafael J. Wysocki return ret; 1057f721889fSRafael J. Wysocki } 1058f721889fSRafael J. Wysocki 1059f721889fSRafael J. Wysocki /** 1060f721889fSRafael J. Wysocki * pm_genpd_remove_device - Remove a device from an I/O PM domain. 1061f721889fSRafael J. Wysocki * @genpd: PM domain to remove the device from. 1062f721889fSRafael J. Wysocki * @dev: Device to be removed. 1063f721889fSRafael J. Wysocki */ 1064f721889fSRafael J. Wysocki int pm_genpd_remove_device(struct generic_pm_domain *genpd, 1065f721889fSRafael J. Wysocki struct device *dev) 1066f721889fSRafael J. Wysocki { 1067f721889fSRafael J. Wysocki struct dev_list_entry *dle; 1068f721889fSRafael J. Wysocki int ret = -EINVAL; 1069f721889fSRafael J. Wysocki 1070f721889fSRafael J. Wysocki dev_dbg(dev, "%s()\n", __func__); 1071f721889fSRafael J. Wysocki 1072f721889fSRafael J. Wysocki if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) 1073f721889fSRafael J. Wysocki return -EINVAL; 1074f721889fSRafael J. Wysocki 107517b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 1076f721889fSRafael J. Wysocki 1077596ba34bSRafael J. Wysocki if (genpd->prepared_count > 0) { 1078596ba34bSRafael J. Wysocki ret = -EAGAIN; 1079596ba34bSRafael J. Wysocki goto out; 1080596ba34bSRafael J. Wysocki } 1081596ba34bSRafael J. Wysocki 1082f721889fSRafael J. Wysocki list_for_each_entry(dle, &genpd->dev_list, node) { 1083f721889fSRafael J. Wysocki if (dle->dev != dev) 1084f721889fSRafael J. Wysocki continue; 1085f721889fSRafael J. Wysocki 1086f721889fSRafael J. Wysocki spin_lock_irq(&dev->power.lock); 1087f721889fSRafael J. Wysocki dev->pm_domain = NULL; 1088f721889fSRafael J. Wysocki spin_unlock_irq(&dev->power.lock); 1089f721889fSRafael J. Wysocki 1090596ba34bSRafael J. Wysocki genpd->device_count--; 1091f721889fSRafael J. Wysocki list_del(&dle->node); 1092f721889fSRafael J. Wysocki kfree(dle); 1093f721889fSRafael J. Wysocki 1094f721889fSRafael J. Wysocki ret = 0; 1095f721889fSRafael J. Wysocki break; 1096f721889fSRafael J. Wysocki } 1097f721889fSRafael J. Wysocki 1098596ba34bSRafael J. Wysocki out: 109917b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 1100f721889fSRafael J. Wysocki 1101f721889fSRafael J. Wysocki return ret; 1102f721889fSRafael J. Wysocki } 1103f721889fSRafael J. Wysocki 1104f721889fSRafael J. Wysocki /** 1105f721889fSRafael J. Wysocki * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. 1106f721889fSRafael J. Wysocki * @genpd: Master PM domain to add the subdomain to. 1107f721889fSRafael J. Wysocki * @new_subdomain: Subdomain to be added. 1108f721889fSRafael J. Wysocki */ 1109f721889fSRafael J. Wysocki int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 1110f721889fSRafael J. Wysocki struct generic_pm_domain *new_subdomain) 1111f721889fSRafael J. Wysocki { 1112f721889fSRafael J. Wysocki struct generic_pm_domain *subdomain; 1113f721889fSRafael J. Wysocki int ret = 0; 1114f721889fSRafael J. Wysocki 1115f721889fSRafael J. Wysocki if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) 1116f721889fSRafael J. Wysocki return -EINVAL; 1117f721889fSRafael J. Wysocki 111817b75ecaSRafael J. Wysocki start: 111917b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 112017b75ecaSRafael J. Wysocki mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); 1121f721889fSRafael J. Wysocki 112217b75ecaSRafael J. Wysocki if (new_subdomain->status != GPD_STATE_POWER_OFF 112317b75ecaSRafael J. Wysocki && new_subdomain->status != GPD_STATE_ACTIVE) { 112417b75ecaSRafael J. Wysocki mutex_unlock(&new_subdomain->lock); 112517b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 112617b75ecaSRafael J. Wysocki goto start; 112717b75ecaSRafael J. Wysocki } 112817b75ecaSRafael J. Wysocki 112917b75ecaSRafael J. Wysocki if (genpd->status == GPD_STATE_POWER_OFF 113017b75ecaSRafael J. Wysocki && new_subdomain->status != GPD_STATE_POWER_OFF) { 1131f721889fSRafael J. Wysocki ret = -EINVAL; 1132f721889fSRafael J. Wysocki goto out; 1133f721889fSRafael J. Wysocki } 1134f721889fSRafael J. Wysocki 1135f721889fSRafael J. Wysocki list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { 1136f721889fSRafael J. Wysocki if (subdomain == new_subdomain) { 1137f721889fSRafael J. Wysocki ret = -EINVAL; 1138f721889fSRafael J. Wysocki goto out; 1139f721889fSRafael J. Wysocki } 1140f721889fSRafael J. Wysocki } 1141f721889fSRafael J. Wysocki 1142f721889fSRafael J. Wysocki list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); 1143f721889fSRafael J. Wysocki new_subdomain->parent = genpd; 114417b75ecaSRafael J. Wysocki if (subdomain->status != GPD_STATE_POWER_OFF) 1145f721889fSRafael J. Wysocki genpd->sd_count++; 1146f721889fSRafael J. Wysocki 1147f721889fSRafael J. Wysocki out: 114817b75ecaSRafael J. Wysocki mutex_unlock(&new_subdomain->lock); 114917b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 1150f721889fSRafael J. Wysocki 1151f721889fSRafael J. Wysocki return ret; 1152f721889fSRafael J. Wysocki } 1153f721889fSRafael J. Wysocki 1154f721889fSRafael J. Wysocki /** 1155f721889fSRafael J. Wysocki * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. 1156f721889fSRafael J. Wysocki * @genpd: Master PM domain to remove the subdomain from. 1157f721889fSRafael J. Wysocki * @target: Subdomain to be removed. 1158f721889fSRafael J. Wysocki */ 1159f721889fSRafael J. Wysocki int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 1160f721889fSRafael J. Wysocki struct generic_pm_domain *target) 1161f721889fSRafael J. Wysocki { 1162f721889fSRafael J. Wysocki struct generic_pm_domain *subdomain; 1163f721889fSRafael J. Wysocki int ret = -EINVAL; 1164f721889fSRafael J. Wysocki 1165f721889fSRafael J. Wysocki if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) 1166f721889fSRafael J. Wysocki return -EINVAL; 1167f721889fSRafael J. Wysocki 116817b75ecaSRafael J. Wysocki start: 116917b75ecaSRafael J. Wysocki genpd_acquire_lock(genpd); 1170f721889fSRafael J. Wysocki 1171f721889fSRafael J. Wysocki list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { 1172f721889fSRafael J. Wysocki if (subdomain != target) 1173f721889fSRafael J. Wysocki continue; 1174f721889fSRafael J. Wysocki 1175f721889fSRafael J. Wysocki mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); 1176f721889fSRafael J. Wysocki 117717b75ecaSRafael J. Wysocki if (subdomain->status != GPD_STATE_POWER_OFF 117817b75ecaSRafael J. Wysocki && subdomain->status != GPD_STATE_ACTIVE) { 117917b75ecaSRafael J. Wysocki mutex_unlock(&subdomain->lock); 118017b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 118117b75ecaSRafael J. Wysocki goto start; 118217b75ecaSRafael J. Wysocki } 118317b75ecaSRafael J. Wysocki 1184f721889fSRafael J. Wysocki list_del(&subdomain->sd_node); 1185f721889fSRafael J. Wysocki subdomain->parent = NULL; 118617b75ecaSRafael J. Wysocki if (subdomain->status != GPD_STATE_POWER_OFF) 1187f721889fSRafael J. Wysocki genpd_sd_counter_dec(genpd); 1188f721889fSRafael J. Wysocki 1189f721889fSRafael J. Wysocki mutex_unlock(&subdomain->lock); 1190f721889fSRafael J. Wysocki 1191f721889fSRafael J. Wysocki ret = 0; 1192f721889fSRafael J. Wysocki break; 1193f721889fSRafael J. Wysocki } 1194f721889fSRafael J. Wysocki 119517b75ecaSRafael J. Wysocki genpd_release_lock(genpd); 1196f721889fSRafael J. Wysocki 1197f721889fSRafael J. Wysocki return ret; 1198f721889fSRafael J. Wysocki } 1199f721889fSRafael J. Wysocki 1200f721889fSRafael J. Wysocki /** 1201f721889fSRafael J. Wysocki * pm_genpd_init - Initialize a generic I/O PM domain object. 1202f721889fSRafael J. Wysocki * @genpd: PM domain object to initialize. 1203f721889fSRafael J. Wysocki * @gov: PM domain governor to associate with the domain (may be NULL). 1204f721889fSRafael J. Wysocki * @is_off: Initial value of the domain's power_is_off field. 1205f721889fSRafael J. Wysocki */ 1206f721889fSRafael J. Wysocki void pm_genpd_init(struct generic_pm_domain *genpd, 1207f721889fSRafael J. Wysocki struct dev_power_governor *gov, bool is_off) 1208f721889fSRafael J. Wysocki { 1209f721889fSRafael J. Wysocki if (IS_ERR_OR_NULL(genpd)) 1210f721889fSRafael J. Wysocki return; 1211f721889fSRafael J. Wysocki 1212f721889fSRafael J. Wysocki INIT_LIST_HEAD(&genpd->sd_node); 1213f721889fSRafael J. Wysocki genpd->parent = NULL; 1214f721889fSRafael J. Wysocki INIT_LIST_HEAD(&genpd->dev_list); 1215f721889fSRafael J. Wysocki INIT_LIST_HEAD(&genpd->sd_list); 1216f721889fSRafael J. Wysocki mutex_init(&genpd->lock); 1217f721889fSRafael J. Wysocki genpd->gov = gov; 1218f721889fSRafael J. Wysocki INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); 1219f721889fSRafael J. Wysocki genpd->in_progress = 0; 1220f721889fSRafael J. Wysocki genpd->sd_count = 0; 122117b75ecaSRafael J. Wysocki genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; 122217b75ecaSRafael J. Wysocki init_waitqueue_head(&genpd->status_wait_queue); 1223c6d22b37SRafael J. Wysocki genpd->poweroff_task = NULL; 1224c6d22b37SRafael J. Wysocki genpd->resume_count = 0; 1225596ba34bSRafael J. Wysocki genpd->device_count = 0; 1226596ba34bSRafael J. Wysocki genpd->suspended_count = 0; 1227f721889fSRafael J. Wysocki genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; 1228f721889fSRafael J. Wysocki genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; 1229f721889fSRafael J. Wysocki genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; 1230596ba34bSRafael J. Wysocki genpd->domain.ops.prepare = pm_genpd_prepare; 1231596ba34bSRafael J. Wysocki genpd->domain.ops.suspend = pm_genpd_suspend; 1232596ba34bSRafael J. Wysocki genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; 1233596ba34bSRafael J. Wysocki genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; 1234596ba34bSRafael J. Wysocki genpd->domain.ops.resume = pm_genpd_resume; 1235596ba34bSRafael J. Wysocki genpd->domain.ops.freeze = pm_genpd_freeze; 1236596ba34bSRafael J. Wysocki genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; 1237596ba34bSRafael J. Wysocki genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; 1238596ba34bSRafael J. Wysocki genpd->domain.ops.thaw = pm_genpd_thaw; 1239596ba34bSRafael J. Wysocki genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; 1240596ba34bSRafael J. Wysocki genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; 1241596ba34bSRafael J. Wysocki genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; 1242596ba34bSRafael J. Wysocki genpd->domain.ops.restore = pm_genpd_restore; 1243596ba34bSRafael J. Wysocki genpd->domain.ops.complete = pm_genpd_complete; 1244f721889fSRafael J. Wysocki } 1245