Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/base/power/domain.c - Common code related to device power domains. |
| 3 | * |
| 4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
| 5 | * |
| 6 | * This file is released under the GPLv2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/pm_runtime.h> |
| 13 | #include <linux/pm_domain.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/err.h> |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 16 | #include <linux/sched.h> |
| 17 | #include <linux/suspend.h> |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 18 | #include <linux/export.h> |
| 19 | |
| 20 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
| 21 | ({ \ |
| 22 | type (*__routine)(struct device *__d); \ |
| 23 | type __ret = (type)0; \ |
| 24 | \ |
| 25 | __routine = genpd->dev_ops.callback; \ |
| 26 | if (__routine) { \ |
| 27 | __ret = __routine(dev); \ |
| 28 | } else { \ |
| 29 | __routine = dev_gpd_data(dev)->ops.callback; \ |
| 30 | if (__routine) \ |
| 31 | __ret = __routine(dev); \ |
| 32 | } \ |
| 33 | __ret; \ |
| 34 | }) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 35 | |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 36 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
| 37 | ({ \ |
| 38 | ktime_t __start = ktime_get(); \ |
| 39 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ |
| 40 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ |
| 41 | struct generic_pm_domain_data *__gpd_data = dev_gpd_data(dev); \ |
| 42 | if (__elapsed > __gpd_data->td.field) { \ |
| 43 | __gpd_data->td.field = __elapsed; \ |
| 44 | dev_warn(dev, name " latency exceeded, new value %lld ns\n", \ |
| 45 | __elapsed); \ |
| 46 | } \ |
| 47 | __retval; \ |
| 48 | }) |
| 49 | |
Rafael J. Wysocki | 5125bbf | 2011-07-13 12:31:52 +0200 | [diff] [blame] | 50 | static LIST_HEAD(gpd_list); |
| 51 | static DEFINE_MUTEX(gpd_list_lock); |
| 52 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 53 | #ifdef CONFIG_PM |
| 54 | |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 55 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 56 | { |
| 57 | if (IS_ERR_OR_NULL(dev->pm_domain)) |
| 58 | return ERR_PTR(-EINVAL); |
| 59 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 60 | return pd_to_genpd(dev->pm_domain); |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 61 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 62 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 63 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 64 | { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 65 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
| 66 | stop_latency_ns, "stop"); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 70 | { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 71 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
| 72 | start_latency_ns, "start"); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 73 | } |
| 74 | |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 75 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 76 | { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 77 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, |
| 78 | save_state_latency_ns, "state save"); |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 82 | { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 83 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
| 84 | restore_state_latency_ns, |
| 85 | "state restore"); |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 86 | } |
| 87 | |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 88 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 89 | { |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 90 | bool ret = false; |
| 91 | |
| 92 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) |
| 93 | ret = !!atomic_dec_and_test(&genpd->sd_count); |
| 94 | |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) |
| 99 | { |
| 100 | atomic_inc(&genpd->sd_count); |
| 101 | smp_mb__after_atomic_inc(); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 102 | } |
| 103 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 104 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
| 105 | { |
| 106 | DEFINE_WAIT(wait); |
| 107 | |
| 108 | mutex_lock(&genpd->lock); |
| 109 | /* |
| 110 | * Wait for the domain to transition into either the active, |
| 111 | * or the power off state. |
| 112 | */ |
| 113 | for (;;) { |
| 114 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
| 115 | TASK_UNINTERRUPTIBLE); |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 116 | if (genpd->status == GPD_STATE_ACTIVE |
| 117 | || genpd->status == GPD_STATE_POWER_OFF) |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 118 | break; |
| 119 | mutex_unlock(&genpd->lock); |
| 120 | |
| 121 | schedule(); |
| 122 | |
| 123 | mutex_lock(&genpd->lock); |
| 124 | } |
| 125 | finish_wait(&genpd->status_wait_queue, &wait); |
| 126 | } |
| 127 | |
| 128 | static void genpd_release_lock(struct generic_pm_domain *genpd) |
| 129 | { |
| 130 | mutex_unlock(&genpd->lock); |
| 131 | } |
| 132 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 133 | static void genpd_set_active(struct generic_pm_domain *genpd) |
| 134 | { |
| 135 | if (genpd->resume_count == 0) |
| 136 | genpd->status = GPD_STATE_ACTIVE; |
| 137 | } |
| 138 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 139 | /** |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 140 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 141 | * @genpd: PM domain to power up. |
| 142 | * |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 143 | * Restore power to @genpd and all of its masters so that it is possible to |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 144 | * resume a device belonging to it. |
| 145 | */ |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 146 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
| 147 | __releases(&genpd->lock) __acquires(&genpd->lock) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 148 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 149 | struct gpd_link *link; |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 150 | DEFINE_WAIT(wait); |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 151 | int ret = 0; |
| 152 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 153 | /* If the domain's master is being waited for, we have to wait too. */ |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 154 | for (;;) { |
| 155 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
| 156 | TASK_UNINTERRUPTIBLE); |
Rafael J. Wysocki | 17877eb | 2011-08-08 23:43:50 +0200 | [diff] [blame] | 157 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 158 | break; |
| 159 | mutex_unlock(&genpd->lock); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 160 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 161 | schedule(); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 162 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 163 | mutex_lock(&genpd->lock); |
| 164 | } |
| 165 | finish_wait(&genpd->status_wait_queue, &wait); |
| 166 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 167 | if (genpd->status == GPD_STATE_ACTIVE |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 168 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 169 | return 0; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 170 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 171 | if (genpd->status != GPD_STATE_POWER_OFF) { |
| 172 | genpd_set_active(genpd); |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 173 | return 0; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 174 | } |
| 175 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 176 | /* |
| 177 | * The list is guaranteed not to change while the loop below is being |
| 178 | * executed, unless one of the masters' .power_on() callbacks fiddles |
| 179 | * with it. |
| 180 | */ |
| 181 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| 182 | genpd_sd_counter_inc(link->master); |
Rafael J. Wysocki | 17877eb | 2011-08-08 23:43:50 +0200 | [diff] [blame] | 183 | genpd->status = GPD_STATE_WAIT_MASTER; |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 184 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 185 | mutex_unlock(&genpd->lock); |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 186 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 187 | ret = pm_genpd_poweron(link->master); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 188 | |
| 189 | mutex_lock(&genpd->lock); |
| 190 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 191 | /* |
| 192 | * The "wait for parent" status is guaranteed not to change |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 193 | * while the master is powering on. |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 194 | */ |
| 195 | genpd->status = GPD_STATE_POWER_OFF; |
| 196 | wake_up_all(&genpd->status_wait_queue); |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 197 | if (ret) { |
| 198 | genpd_sd_counter_dec(link->master); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 199 | goto err; |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 200 | } |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 201 | } |
| 202 | |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 203 | if (genpd->power_on) { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 204 | ktime_t time_start = ktime_get(); |
| 205 | s64 elapsed_ns; |
| 206 | |
Rafael J. Wysocki | fe202fd | 2011-08-05 21:45:11 +0200 | [diff] [blame] | 207 | ret = genpd->power_on(genpd); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 208 | if (ret) |
| 209 | goto err; |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 210 | |
| 211 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
| 212 | if (elapsed_ns > genpd->power_on_latency_ns) |
| 213 | genpd->power_on_latency_ns = elapsed_ns; |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 214 | } |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 215 | |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 216 | genpd_set_active(genpd); |
| 217 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 218 | return 0; |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 219 | |
| 220 | err: |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 221 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
| 222 | genpd_sd_counter_dec(link->master); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 223 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 224 | return ret; |
| 225 | } |
| 226 | |
| 227 | /** |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 228 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 229 | * @genpd: PM domain to power up. |
| 230 | */ |
| 231 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
| 232 | { |
| 233 | int ret; |
| 234 | |
| 235 | mutex_lock(&genpd->lock); |
| 236 | ret = __pm_genpd_poweron(genpd); |
| 237 | mutex_unlock(&genpd->lock); |
| 238 | return ret; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | #endif /* CONFIG_PM */ |
| 242 | |
| 243 | #ifdef CONFIG_PM_RUNTIME |
| 244 | |
| 245 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 246 | * __pm_genpd_save_device - Save the pre-suspend state of a device. |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 247 | * @pdd: Domain data of the device to save the state of. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 248 | * @genpd: PM domain the device belongs to. |
| 249 | */ |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 250 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 251 | struct generic_pm_domain *genpd) |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 252 | __releases(&genpd->lock) __acquires(&genpd->lock) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 253 | { |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 254 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 255 | struct device *dev = pdd->dev; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 256 | int ret = 0; |
| 257 | |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 258 | if (gpd_data->need_restore) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 259 | return 0; |
| 260 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 261 | mutex_unlock(&genpd->lock); |
| 262 | |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 263 | genpd_start_dev(genpd, dev); |
| 264 | ret = genpd_save_dev(genpd, dev); |
| 265 | genpd_stop_dev(genpd, dev); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 266 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 267 | mutex_lock(&genpd->lock); |
| 268 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 269 | if (!ret) |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 270 | gpd_data->need_restore = true; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 277 | * @pdd: Domain data of the device to restore the state of. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 278 | * @genpd: PM domain the device belongs to. |
| 279 | */ |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 280 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 281 | struct generic_pm_domain *genpd) |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 282 | __releases(&genpd->lock) __acquires(&genpd->lock) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 283 | { |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 284 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 285 | struct device *dev = pdd->dev; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 286 | |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 287 | if (!gpd_data->need_restore) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 288 | return; |
| 289 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 290 | mutex_unlock(&genpd->lock); |
| 291 | |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 292 | genpd_start_dev(genpd, dev); |
| 293 | genpd_restore_dev(genpd, dev); |
| 294 | genpd_stop_dev(genpd, dev); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 295 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 296 | mutex_lock(&genpd->lock); |
| 297 | |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 298 | gpd_data->need_restore = false; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /** |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 302 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. |
| 303 | * @genpd: PM domain to check. |
| 304 | * |
| 305 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during |
| 306 | * a "power off" operation, which means that a "power on" has occured in the |
| 307 | * meantime, or if its resume_count field is different from zero, which means |
| 308 | * that one of its devices has been resumed in the meantime. |
| 309 | */ |
| 310 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) |
| 311 | { |
Rafael J. Wysocki | 17877eb | 2011-08-08 23:43:50 +0200 | [diff] [blame] | 312 | return genpd->status == GPD_STATE_WAIT_MASTER |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 313 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | /** |
Rafael J. Wysocki | 56375fd | 2011-07-12 00:40:03 +0200 | [diff] [blame] | 317 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). |
| 318 | * @genpd: PM domait to power off. |
| 319 | * |
| 320 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done |
| 321 | * before. |
| 322 | */ |
Rafael J. Wysocki | 0bc5b2d | 2011-07-14 20:59:07 +0200 | [diff] [blame] | 323 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
Rafael J. Wysocki | 56375fd | 2011-07-12 00:40:03 +0200 | [diff] [blame] | 324 | { |
| 325 | if (!work_pending(&genpd->power_off_work)) |
| 326 | queue_work(pm_wq, &genpd->power_off_work); |
| 327 | } |
| 328 | |
| 329 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 330 | * pm_genpd_poweroff - Remove power from a given PM domain. |
| 331 | * @genpd: PM domain to power down. |
| 332 | * |
| 333 | * If all of the @genpd's devices have been suspended and all of its subdomains |
| 334 | * have been powered down, run the runtime suspend callbacks provided by all of |
| 335 | * the @genpd's devices' drivers and remove power from @genpd. |
| 336 | */ |
| 337 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 338 | __releases(&genpd->lock) __acquires(&genpd->lock) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 339 | { |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 340 | struct pm_domain_data *pdd; |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 341 | struct gpd_link *link; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 342 | unsigned int not_suspended; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 343 | int ret = 0; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 344 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 345 | start: |
| 346 | /* |
| 347 | * Do not try to power off the domain in the following situations: |
| 348 | * (1) The domain is already in the "power off" state. |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 349 | * (2) The domain is waiting for its master to power up. |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 350 | * (3) One of the domain's devices is being resumed right now. |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 351 | * (4) System suspend is in progress. |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 352 | */ |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 353 | if (genpd->status == GPD_STATE_POWER_OFF |
Rafael J. Wysocki | 17877eb | 2011-08-08 23:43:50 +0200 | [diff] [blame] | 354 | || genpd->status == GPD_STATE_WAIT_MASTER |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 355 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 356 | return 0; |
| 357 | |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 358 | if (atomic_read(&genpd->sd_count) > 0) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 359 | return -EBUSY; |
| 360 | |
| 361 | not_suspended = 0; |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 362 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 363 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
| 364 | || pdd->dev->power.irq_safe)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 365 | not_suspended++; |
| 366 | |
| 367 | if (not_suspended > genpd->in_progress) |
| 368 | return -EBUSY; |
| 369 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 370 | if (genpd->poweroff_task) { |
| 371 | /* |
| 372 | * Another instance of pm_genpd_poweroff() is executing |
| 373 | * callbacks, so tell it to start over and return. |
| 374 | */ |
| 375 | genpd->status = GPD_STATE_REPEAT; |
| 376 | return 0; |
| 377 | } |
| 378 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 379 | if (genpd->gov && genpd->gov->power_down_ok) { |
| 380 | if (!genpd->gov->power_down_ok(&genpd->domain)) |
| 381 | return -EAGAIN; |
| 382 | } |
| 383 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 384 | genpd->status = GPD_STATE_BUSY; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 385 | genpd->poweroff_task = current; |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 386 | |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 387 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 388 | ret = atomic_read(&genpd->sd_count) == 0 ? |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 389 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 390 | |
| 391 | if (genpd_abort_poweroff(genpd)) |
| 392 | goto out; |
| 393 | |
Rafael J. Wysocki | 697a7f3 | 2011-07-12 00:39:48 +0200 | [diff] [blame] | 394 | if (ret) { |
| 395 | genpd_set_active(genpd); |
| 396 | goto out; |
| 397 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 398 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 399 | if (genpd->status == GPD_STATE_REPEAT) { |
| 400 | genpd->poweroff_task = NULL; |
| 401 | goto start; |
| 402 | } |
| 403 | } |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 404 | |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 405 | if (genpd->power_off) { |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 406 | ktime_t time_start; |
| 407 | s64 elapsed_ns; |
| 408 | |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 409 | if (atomic_read(&genpd->sd_count) > 0) { |
| 410 | ret = -EBUSY; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 411 | goto out; |
| 412 | } |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 413 | |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 414 | time_start = ktime_get(); |
| 415 | |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 416 | /* |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 417 | * If sd_count > 0 at this point, one of the subdomains hasn't |
| 418 | * managed to call pm_genpd_poweron() for the master yet after |
Rafael J. Wysocki | 3c07cbc | 2011-08-08 23:43:14 +0200 | [diff] [blame] | 419 | * incrementing it. In that case pm_genpd_poweron() will wait |
| 420 | * for us to drop the lock, so we can call .power_off() and let |
| 421 | * the pm_genpd_poweron() restore power for us (this shouldn't |
| 422 | * happen very often). |
| 423 | */ |
Rafael J. Wysocki | d280540 | 2011-07-14 20:59:20 +0200 | [diff] [blame] | 424 | ret = genpd->power_off(genpd); |
| 425 | if (ret == -EBUSY) { |
| 426 | genpd_set_active(genpd); |
Rafael J. Wysocki | d280540 | 2011-07-14 20:59:20 +0200 | [diff] [blame] | 427 | goto out; |
| 428 | } |
Rafael J. Wysocki | 0140d8b | 2011-12-01 00:02:17 +0100 | [diff] [blame^] | 429 | |
| 430 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
| 431 | if (elapsed_ns > genpd->power_off_latency_ns) |
| 432 | genpd->power_off_latency_ns = elapsed_ns; |
Rafael J. Wysocki | d280540 | 2011-07-14 20:59:20 +0200 | [diff] [blame] | 433 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 434 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 435 | genpd->status = GPD_STATE_POWER_OFF; |
Rafael J. Wysocki | 221e9b5 | 2011-12-01 00:02:10 +0100 | [diff] [blame] | 436 | genpd->power_off_time = ktime_get(); |
| 437 | |
| 438 | /* Update PM QoS information for devices in the domain. */ |
| 439 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
| 440 | struct gpd_timing_data *td = &to_gpd_data(pdd)->td; |
| 441 | |
| 442 | pm_runtime_update_max_time_suspended(pdd->dev, |
| 443 | td->start_latency_ns + |
| 444 | td->restore_state_latency_ns + |
| 445 | genpd->power_on_latency_ns); |
| 446 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 447 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 448 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| 449 | genpd_sd_counter_dec(link->master); |
| 450 | genpd_queue_power_off_work(link->master); |
| 451 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 452 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 453 | out: |
| 454 | genpd->poweroff_task = NULL; |
| 455 | wake_up_all(&genpd->status_wait_queue); |
| 456 | return ret; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | /** |
| 460 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. |
| 461 | * @work: Work structure used for scheduling the execution of this function. |
| 462 | */ |
| 463 | static void genpd_power_off_work_fn(struct work_struct *work) |
| 464 | { |
| 465 | struct generic_pm_domain *genpd; |
| 466 | |
| 467 | genpd = container_of(work, struct generic_pm_domain, power_off_work); |
| 468 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 469 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 470 | pm_genpd_poweroff(genpd); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 471 | genpd_release_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | /** |
| 475 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
| 476 | * @dev: Device to suspend. |
| 477 | * |
| 478 | * Carry out a runtime suspend of a device under the assumption that its |
| 479 | * pm_domain field points to the domain member of an object of type |
| 480 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 481 | */ |
| 482 | static int pm_genpd_runtime_suspend(struct device *dev) |
| 483 | { |
| 484 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 485 | bool (*stop_ok)(struct device *__dev); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 486 | int ret; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 487 | |
| 488 | dev_dbg(dev, "%s()\n", __func__); |
| 489 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 490 | genpd = dev_to_genpd(dev); |
| 491 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 492 | return -EINVAL; |
| 493 | |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 494 | might_sleep_if(!genpd->dev_irq_safe); |
| 495 | |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 496 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
| 497 | if (stop_ok && !stop_ok(dev)) |
| 498 | return -EBUSY; |
| 499 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 500 | ret = genpd_stop_dev(genpd, dev); |
| 501 | if (ret) |
| 502 | return ret; |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 503 | |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 504 | pm_runtime_update_max_time_suspended(dev, |
| 505 | dev_gpd_data(dev)->td.start_latency_ns); |
| 506 | |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 507 | /* |
| 508 | * If power.irq_safe is set, this routine will be run with interrupts |
| 509 | * off, so it can't use mutexes. |
| 510 | */ |
| 511 | if (dev->power.irq_safe) |
| 512 | return 0; |
| 513 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 514 | mutex_lock(&genpd->lock); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 515 | genpd->in_progress++; |
| 516 | pm_genpd_poweroff(genpd); |
| 517 | genpd->in_progress--; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 518 | mutex_unlock(&genpd->lock); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 524 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
| 525 | * @dev: Device to resume. |
| 526 | * |
| 527 | * Carry out a runtime resume of a device under the assumption that its |
| 528 | * pm_domain field points to the domain member of an object of type |
| 529 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 530 | */ |
| 531 | static int pm_genpd_runtime_resume(struct device *dev) |
| 532 | { |
| 533 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 534 | DEFINE_WAIT(wait); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 535 | int ret; |
| 536 | |
| 537 | dev_dbg(dev, "%s()\n", __func__); |
| 538 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 539 | genpd = dev_to_genpd(dev); |
| 540 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 541 | return -EINVAL; |
| 542 | |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 543 | might_sleep_if(!genpd->dev_irq_safe); |
| 544 | |
| 545 | /* If power.irq_safe, the PM domain is never powered off. */ |
| 546 | if (dev->power.irq_safe) |
| 547 | goto out; |
| 548 | |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 549 | mutex_lock(&genpd->lock); |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 550 | ret = __pm_genpd_poweron(genpd); |
| 551 | if (ret) { |
| 552 | mutex_unlock(&genpd->lock); |
| 553 | return ret; |
| 554 | } |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 555 | genpd->status = GPD_STATE_BUSY; |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 556 | genpd->resume_count++; |
| 557 | for (;;) { |
| 558 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
| 559 | TASK_UNINTERRUPTIBLE); |
| 560 | /* |
| 561 | * If current is the powering off task, we have been called |
| 562 | * reentrantly from one of the device callbacks, so we should |
| 563 | * not wait. |
| 564 | */ |
| 565 | if (!genpd->poweroff_task || genpd->poweroff_task == current) |
| 566 | break; |
| 567 | mutex_unlock(&genpd->lock); |
| 568 | |
| 569 | schedule(); |
| 570 | |
| 571 | mutex_lock(&genpd->lock); |
| 572 | } |
| 573 | finish_wait(&genpd->status_wait_queue, &wait); |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 574 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 575 | genpd->resume_count--; |
| 576 | genpd_set_active(genpd); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 577 | wake_up_all(&genpd->status_wait_queue); |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 578 | mutex_unlock(&genpd->lock); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 579 | |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 580 | out: |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 581 | genpd_start_dev(genpd, dev); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 582 | |
| 583 | return 0; |
| 584 | } |
| 585 | |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 586 | /** |
| 587 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. |
| 588 | */ |
| 589 | void pm_genpd_poweroff_unused(void) |
| 590 | { |
| 591 | struct generic_pm_domain *genpd; |
| 592 | |
| 593 | mutex_lock(&gpd_list_lock); |
| 594 | |
| 595 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
| 596 | genpd_queue_power_off_work(genpd); |
| 597 | |
| 598 | mutex_unlock(&gpd_list_lock); |
| 599 | } |
| 600 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 601 | #else |
| 602 | |
| 603 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
| 604 | |
| 605 | #define pm_genpd_runtime_suspend NULL |
| 606 | #define pm_genpd_runtime_resume NULL |
| 607 | |
| 608 | #endif /* CONFIG_PM_RUNTIME */ |
| 609 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 610 | #ifdef CONFIG_PM_SLEEP |
| 611 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 612 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
| 613 | struct device *dev) |
| 614 | { |
| 615 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); |
| 616 | } |
| 617 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 618 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 619 | { |
| 620 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); |
| 621 | } |
| 622 | |
| 623 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) |
| 624 | { |
| 625 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); |
| 626 | } |
| 627 | |
| 628 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) |
| 629 | { |
| 630 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); |
| 631 | } |
| 632 | |
| 633 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 634 | { |
| 635 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); |
| 636 | } |
| 637 | |
| 638 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 639 | { |
| 640 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); |
| 641 | } |
| 642 | |
| 643 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) |
| 644 | { |
| 645 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); |
| 646 | } |
| 647 | |
| 648 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) |
| 649 | { |
| 650 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); |
| 651 | } |
| 652 | |
| 653 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) |
| 654 | { |
| 655 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); |
| 656 | } |
| 657 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 658 | /** |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 659 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 660 | * @genpd: PM domain to power off, if possible. |
| 661 | * |
| 662 | * Check if the given PM domain can be powered off (during system suspend or |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 663 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 664 | * |
| 665 | * This function is only called in "noirq" stages of system power transitions, |
| 666 | * so it need not acquire locks (all of the "noirq" callbacks are executed |
| 667 | * sequentially, so it is guaranteed that it will never run twice in parallel). |
| 668 | */ |
| 669 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) |
| 670 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 671 | struct gpd_link *link; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 672 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 673 | if (genpd->status == GPD_STATE_POWER_OFF) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 674 | return; |
| 675 | |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 676 | if (genpd->suspended_count != genpd->device_count |
| 677 | || atomic_read(&genpd->sd_count) > 0) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 678 | return; |
| 679 | |
| 680 | if (genpd->power_off) |
| 681 | genpd->power_off(genpd); |
| 682 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 683 | genpd->status = GPD_STATE_POWER_OFF; |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 684 | |
| 685 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| 686 | genpd_sd_counter_dec(link->master); |
| 687 | pm_genpd_sync_poweroff(link->master); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 688 | } |
| 689 | } |
| 690 | |
| 691 | /** |
Rafael J. Wysocki | 4ecd6e6 | 2011-07-12 00:39:57 +0200 | [diff] [blame] | 692 | * resume_needed - Check whether to resume a device before system suspend. |
| 693 | * @dev: Device to check. |
| 694 | * @genpd: PM domain the device belongs to. |
| 695 | * |
| 696 | * There are two cases in which a device that can wake up the system from sleep |
| 697 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled |
| 698 | * to wake up the system and it has to remain active for this purpose while the |
| 699 | * system is in the sleep state and (2) if the device is not enabled to wake up |
| 700 | * the system from sleep states and it generally doesn't generate wakeup signals |
| 701 | * by itself (those signals are generated on its behalf by other parts of the |
| 702 | * system). In the latter case it may be necessary to reconfigure the device's |
| 703 | * wakeup settings during system suspend, because it may have been set up to |
| 704 | * signal remote wakeup from the system's working state as needed by runtime PM. |
| 705 | * Return 'true' in either of the above cases. |
| 706 | */ |
| 707 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) |
| 708 | { |
| 709 | bool active_wakeup; |
| 710 | |
| 711 | if (!device_can_wakeup(dev)) |
| 712 | return false; |
| 713 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 714 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
Rafael J. Wysocki | 4ecd6e6 | 2011-07-12 00:39:57 +0200 | [diff] [blame] | 715 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
| 716 | } |
| 717 | |
| 718 | /** |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 719 | * pm_genpd_prepare - Start power transition of a device in a PM domain. |
| 720 | * @dev: Device to start the transition of. |
| 721 | * |
| 722 | * Start a power transition of a device (during a system-wide power transition) |
| 723 | * under the assumption that its pm_domain field points to the domain member of |
| 724 | * an object of type struct generic_pm_domain representing a PM domain |
| 725 | * consisting of I/O devices. |
| 726 | */ |
| 727 | static int pm_genpd_prepare(struct device *dev) |
| 728 | { |
| 729 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 730 | int ret; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 731 | |
| 732 | dev_dbg(dev, "%s()\n", __func__); |
| 733 | |
| 734 | genpd = dev_to_genpd(dev); |
| 735 | if (IS_ERR(genpd)) |
| 736 | return -EINVAL; |
| 737 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 738 | /* |
| 739 | * If a wakeup request is pending for the device, it should be woken up |
| 740 | * at this point and a system wakeup event should be reported if it's |
| 741 | * set up to wake up the system from sleep states. |
| 742 | */ |
| 743 | pm_runtime_get_noresume(dev); |
| 744 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
| 745 | pm_wakeup_event(dev, 0); |
| 746 | |
| 747 | if (pm_wakeup_pending()) { |
| 748 | pm_runtime_put_sync(dev); |
| 749 | return -EBUSY; |
| 750 | } |
| 751 | |
Rafael J. Wysocki | 4ecd6e6 | 2011-07-12 00:39:57 +0200 | [diff] [blame] | 752 | if (resume_needed(dev, genpd)) |
| 753 | pm_runtime_resume(dev); |
| 754 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 755 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 756 | |
| 757 | if (genpd->prepared_count++ == 0) |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 758 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
| 759 | |
| 760 | genpd_release_lock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 761 | |
| 762 | if (genpd->suspend_power_off) { |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 763 | pm_runtime_put_noidle(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 764 | return 0; |
| 765 | } |
| 766 | |
| 767 | /* |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 768 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
| 769 | * so pm_genpd_poweron() will return immediately, but if the device |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 770 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 771 | * to make it operational. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 772 | */ |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 773 | pm_runtime_resume(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 774 | __pm_runtime_disable(dev, false); |
| 775 | |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 776 | ret = pm_generic_prepare(dev); |
| 777 | if (ret) { |
| 778 | mutex_lock(&genpd->lock); |
| 779 | |
| 780 | if (--genpd->prepared_count == 0) |
| 781 | genpd->suspend_power_off = false; |
| 782 | |
| 783 | mutex_unlock(&genpd->lock); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 784 | pm_runtime_enable(dev); |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 785 | } |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 786 | |
| 787 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 788 | return ret; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | /** |
| 792 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. |
| 793 | * @dev: Device to suspend. |
| 794 | * |
| 795 | * Suspend a device under the assumption that its pm_domain field points to the |
| 796 | * domain member of an object of type struct generic_pm_domain representing |
| 797 | * a PM domain consisting of I/O devices. |
| 798 | */ |
| 799 | static int pm_genpd_suspend(struct device *dev) |
| 800 | { |
| 801 | struct generic_pm_domain *genpd; |
| 802 | |
| 803 | dev_dbg(dev, "%s()\n", __func__); |
| 804 | |
| 805 | genpd = dev_to_genpd(dev); |
| 806 | if (IS_ERR(genpd)) |
| 807 | return -EINVAL; |
| 808 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 809 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | /** |
| 813 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. |
| 814 | * @dev: Device to suspend. |
| 815 | * |
| 816 | * Carry out a late suspend of a device under the assumption that its |
| 817 | * pm_domain field points to the domain member of an object of type |
| 818 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 819 | */ |
| 820 | static int pm_genpd_suspend_noirq(struct device *dev) |
| 821 | { |
| 822 | struct generic_pm_domain *genpd; |
| 823 | int ret; |
| 824 | |
| 825 | dev_dbg(dev, "%s()\n", __func__); |
| 826 | |
| 827 | genpd = dev_to_genpd(dev); |
| 828 | if (IS_ERR(genpd)) |
| 829 | return -EINVAL; |
| 830 | |
| 831 | if (genpd->suspend_power_off) |
| 832 | return 0; |
| 833 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 834 | ret = genpd_suspend_late(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 835 | if (ret) |
| 836 | return ret; |
| 837 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 838 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
Rafael J. Wysocki | d4f2d87 | 2011-07-01 22:13:29 +0200 | [diff] [blame] | 839 | return 0; |
| 840 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 841 | genpd_stop_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 842 | |
| 843 | /* |
| 844 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 845 | * guaranteed that this function will never run twice in parallel for |
| 846 | * the same PM domain, so it is not necessary to use locking here. |
| 847 | */ |
| 848 | genpd->suspended_count++; |
| 849 | pm_genpd_sync_poweroff(genpd); |
| 850 | |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. |
| 856 | * @dev: Device to resume. |
| 857 | * |
| 858 | * Carry out an early resume of a device under the assumption that its |
| 859 | * pm_domain field points to the domain member of an object of type |
| 860 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 861 | * devices. |
| 862 | */ |
| 863 | static int pm_genpd_resume_noirq(struct device *dev) |
| 864 | { |
| 865 | struct generic_pm_domain *genpd; |
| 866 | |
| 867 | dev_dbg(dev, "%s()\n", __func__); |
| 868 | |
| 869 | genpd = dev_to_genpd(dev); |
| 870 | if (IS_ERR(genpd)) |
| 871 | return -EINVAL; |
| 872 | |
| 873 | if (genpd->suspend_power_off) |
| 874 | return 0; |
| 875 | |
| 876 | /* |
| 877 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 878 | * guaranteed that this function will never run twice in parallel for |
| 879 | * the same PM domain, so it is not necessary to use locking here. |
| 880 | */ |
| 881 | pm_genpd_poweron(genpd); |
| 882 | genpd->suspended_count--; |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 883 | genpd_start_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 884 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 885 | return genpd_resume_early(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 886 | } |
| 887 | |
| 888 | /** |
| 889 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. |
| 890 | * @dev: Device to resume. |
| 891 | * |
| 892 | * Resume a device under the assumption that its pm_domain field points to the |
| 893 | * domain member of an object of type struct generic_pm_domain representing |
| 894 | * a power domain consisting of I/O devices. |
| 895 | */ |
| 896 | static int pm_genpd_resume(struct device *dev) |
| 897 | { |
| 898 | struct generic_pm_domain *genpd; |
| 899 | |
| 900 | dev_dbg(dev, "%s()\n", __func__); |
| 901 | |
| 902 | genpd = dev_to_genpd(dev); |
| 903 | if (IS_ERR(genpd)) |
| 904 | return -EINVAL; |
| 905 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 906 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | /** |
| 910 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. |
| 911 | * @dev: Device to freeze. |
| 912 | * |
| 913 | * Freeze a device under the assumption that its pm_domain field points to the |
| 914 | * domain member of an object of type struct generic_pm_domain representing |
| 915 | * a power domain consisting of I/O devices. |
| 916 | */ |
| 917 | static int pm_genpd_freeze(struct device *dev) |
| 918 | { |
| 919 | struct generic_pm_domain *genpd; |
| 920 | |
| 921 | dev_dbg(dev, "%s()\n", __func__); |
| 922 | |
| 923 | genpd = dev_to_genpd(dev); |
| 924 | if (IS_ERR(genpd)) |
| 925 | return -EINVAL; |
| 926 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 927 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | /** |
| 931 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. |
| 932 | * @dev: Device to freeze. |
| 933 | * |
| 934 | * Carry out a late freeze of a device under the assumption that its |
| 935 | * pm_domain field points to the domain member of an object of type |
| 936 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 937 | * devices. |
| 938 | */ |
| 939 | static int pm_genpd_freeze_noirq(struct device *dev) |
| 940 | { |
| 941 | struct generic_pm_domain *genpd; |
| 942 | int ret; |
| 943 | |
| 944 | dev_dbg(dev, "%s()\n", __func__); |
| 945 | |
| 946 | genpd = dev_to_genpd(dev); |
| 947 | if (IS_ERR(genpd)) |
| 948 | return -EINVAL; |
| 949 | |
| 950 | if (genpd->suspend_power_off) |
| 951 | return 0; |
| 952 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 953 | ret = genpd_freeze_late(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 954 | if (ret) |
| 955 | return ret; |
| 956 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 957 | genpd_stop_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /** |
| 963 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. |
| 964 | * @dev: Device to thaw. |
| 965 | * |
| 966 | * Carry out an early thaw of a device under the assumption that its |
| 967 | * pm_domain field points to the domain member of an object of type |
| 968 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 969 | * devices. |
| 970 | */ |
| 971 | static int pm_genpd_thaw_noirq(struct device *dev) |
| 972 | { |
| 973 | struct generic_pm_domain *genpd; |
| 974 | |
| 975 | dev_dbg(dev, "%s()\n", __func__); |
| 976 | |
| 977 | genpd = dev_to_genpd(dev); |
| 978 | if (IS_ERR(genpd)) |
| 979 | return -EINVAL; |
| 980 | |
| 981 | if (genpd->suspend_power_off) |
| 982 | return 0; |
| 983 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 984 | genpd_start_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 985 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 986 | return genpd_thaw_early(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | /** |
| 990 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. |
| 991 | * @dev: Device to thaw. |
| 992 | * |
| 993 | * Thaw a device under the assumption that its pm_domain field points to the |
| 994 | * domain member of an object of type struct generic_pm_domain representing |
| 995 | * a power domain consisting of I/O devices. |
| 996 | */ |
| 997 | static int pm_genpd_thaw(struct device *dev) |
| 998 | { |
| 999 | struct generic_pm_domain *genpd; |
| 1000 | |
| 1001 | dev_dbg(dev, "%s()\n", __func__); |
| 1002 | |
| 1003 | genpd = dev_to_genpd(dev); |
| 1004 | if (IS_ERR(genpd)) |
| 1005 | return -EINVAL; |
| 1006 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1007 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | /** |
| 1011 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. |
| 1012 | * @dev: Device to resume. |
| 1013 | * |
| 1014 | * Carry out an early restore of a device under the assumption that its |
| 1015 | * pm_domain field points to the domain member of an object of type |
| 1016 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 1017 | * devices. |
| 1018 | */ |
| 1019 | static int pm_genpd_restore_noirq(struct device *dev) |
| 1020 | { |
| 1021 | struct generic_pm_domain *genpd; |
| 1022 | |
| 1023 | dev_dbg(dev, "%s()\n", __func__); |
| 1024 | |
| 1025 | genpd = dev_to_genpd(dev); |
| 1026 | if (IS_ERR(genpd)) |
| 1027 | return -EINVAL; |
| 1028 | |
| 1029 | /* |
| 1030 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 1031 | * guaranteed that this function will never run twice in parallel for |
| 1032 | * the same PM domain, so it is not necessary to use locking here. |
| 1033 | */ |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1034 | genpd->status = GPD_STATE_POWER_OFF; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1035 | if (genpd->suspend_power_off) { |
| 1036 | /* |
| 1037 | * The boot kernel might put the domain into the power on state, |
| 1038 | * so make sure it really is powered off. |
| 1039 | */ |
| 1040 | if (genpd->power_off) |
| 1041 | genpd->power_off(genpd); |
| 1042 | return 0; |
| 1043 | } |
| 1044 | |
| 1045 | pm_genpd_poweron(genpd); |
| 1046 | genpd->suspended_count--; |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1047 | genpd_start_dev(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1048 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1049 | return genpd_resume_early(genpd, dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1050 | } |
| 1051 | |
| 1052 | /** |
| 1053 | * pm_genpd_complete - Complete power transition of a device in a power domain. |
| 1054 | * @dev: Device to complete the transition of. |
| 1055 | * |
| 1056 | * Complete a power transition of a device (during a system-wide power |
| 1057 | * transition) under the assumption that its pm_domain field points to the |
| 1058 | * domain member of an object of type struct generic_pm_domain representing |
| 1059 | * a power domain consisting of I/O devices. |
| 1060 | */ |
| 1061 | static void pm_genpd_complete(struct device *dev) |
| 1062 | { |
| 1063 | struct generic_pm_domain *genpd; |
| 1064 | bool run_complete; |
| 1065 | |
| 1066 | dev_dbg(dev, "%s()\n", __func__); |
| 1067 | |
| 1068 | genpd = dev_to_genpd(dev); |
| 1069 | if (IS_ERR(genpd)) |
| 1070 | return; |
| 1071 | |
| 1072 | mutex_lock(&genpd->lock); |
| 1073 | |
| 1074 | run_complete = !genpd->suspend_power_off; |
| 1075 | if (--genpd->prepared_count == 0) |
| 1076 | genpd->suspend_power_off = false; |
| 1077 | |
| 1078 | mutex_unlock(&genpd->lock); |
| 1079 | |
| 1080 | if (run_complete) { |
| 1081 | pm_generic_complete(dev); |
Rafael J. Wysocki | 6f00ff7 | 2011-07-12 00:39:10 +0200 | [diff] [blame] | 1082 | pm_runtime_set_active(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1083 | pm_runtime_enable(dev); |
Rafael J. Wysocki | 6f00ff7 | 2011-07-12 00:39:10 +0200 | [diff] [blame] | 1084 | pm_runtime_idle(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | #else |
| 1089 | |
| 1090 | #define pm_genpd_prepare NULL |
| 1091 | #define pm_genpd_suspend NULL |
| 1092 | #define pm_genpd_suspend_noirq NULL |
| 1093 | #define pm_genpd_resume_noirq NULL |
| 1094 | #define pm_genpd_resume NULL |
| 1095 | #define pm_genpd_freeze NULL |
| 1096 | #define pm_genpd_freeze_noirq NULL |
| 1097 | #define pm_genpd_thaw_noirq NULL |
| 1098 | #define pm_genpd_thaw NULL |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1099 | #define pm_genpd_restore_noirq NULL |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1100 | #define pm_genpd_complete NULL |
| 1101 | |
| 1102 | #endif /* CONFIG_PM_SLEEP */ |
| 1103 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1104 | /** |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1105 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1106 | * @genpd: PM domain to add the device to. |
| 1107 | * @dev: Device to be added. |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1108 | * @td: Set of PM QoS timing parameters to attach to the device. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1109 | */ |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1110 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
| 1111 | struct gpd_timing_data *td) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1112 | { |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 1113 | struct generic_pm_domain_data *gpd_data; |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1114 | struct pm_domain_data *pdd; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1115 | int ret = 0; |
| 1116 | |
| 1117 | dev_dbg(dev, "%s()\n", __func__); |
| 1118 | |
| 1119 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
| 1120 | return -EINVAL; |
| 1121 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1122 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1123 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1124 | if (genpd->status == GPD_STATE_POWER_OFF) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1125 | ret = -EINVAL; |
| 1126 | goto out; |
| 1127 | } |
| 1128 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1129 | if (genpd->prepared_count > 0) { |
| 1130 | ret = -EAGAIN; |
| 1131 | goto out; |
| 1132 | } |
| 1133 | |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1134 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
| 1135 | if (pdd->dev == dev) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1136 | ret = -EINVAL; |
| 1137 | goto out; |
| 1138 | } |
| 1139 | |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 1140 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
| 1141 | if (!gpd_data) { |
| 1142 | ret = -ENOMEM; |
| 1143 | goto out; |
| 1144 | } |
| 1145 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1146 | genpd->device_count++; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1147 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1148 | dev->pm_domain = &genpd->domain; |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1149 | dev_pm_get_subsys_data(dev); |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 1150 | dev->power.subsys_data->domain_data = &gpd_data->base; |
| 1151 | gpd_data->base.dev = dev; |
| 1152 | gpd_data->need_restore = false; |
| 1153 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1154 | if (td) |
| 1155 | gpd_data->td = *td; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1156 | |
| 1157 | out: |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1158 | genpd_release_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1159 | |
| 1160 | return ret; |
| 1161 | } |
| 1162 | |
| 1163 | /** |
| 1164 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. |
| 1165 | * @genpd: PM domain to remove the device from. |
| 1166 | * @dev: Device to be removed. |
| 1167 | */ |
| 1168 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
| 1169 | struct device *dev) |
| 1170 | { |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1171 | struct pm_domain_data *pdd; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1172 | int ret = -EINVAL; |
| 1173 | |
| 1174 | dev_dbg(dev, "%s()\n", __func__); |
| 1175 | |
| 1176 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
| 1177 | return -EINVAL; |
| 1178 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1179 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1180 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1181 | if (genpd->prepared_count > 0) { |
| 1182 | ret = -EAGAIN; |
| 1183 | goto out; |
| 1184 | } |
| 1185 | |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1186 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
| 1187 | if (pdd->dev != dev) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1188 | continue; |
| 1189 | |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1190 | list_del_init(&pdd->list_node); |
| 1191 | pdd->dev = NULL; |
| 1192 | dev_pm_put_subsys_data(dev); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1193 | dev->pm_domain = NULL; |
Rafael J. Wysocki | cd0ea67 | 2011-09-26 20:22:02 +0200 | [diff] [blame] | 1194 | kfree(to_gpd_data(pdd)); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1195 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1196 | genpd->device_count--; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1197 | |
| 1198 | ret = 0; |
| 1199 | break; |
| 1200 | } |
| 1201 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1202 | out: |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1203 | genpd_release_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1204 | |
| 1205 | return ret; |
| 1206 | } |
| 1207 | |
| 1208 | /** |
| 1209 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
| 1210 | * @genpd: Master PM domain to add the subdomain to. |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1211 | * @subdomain: Subdomain to be added. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1212 | */ |
| 1213 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1214 | struct generic_pm_domain *subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1215 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1216 | struct gpd_link *link; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1217 | int ret = 0; |
| 1218 | |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1219 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1220 | return -EINVAL; |
| 1221 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1222 | start: |
| 1223 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1224 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1225 | |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1226 | if (subdomain->status != GPD_STATE_POWER_OFF |
| 1227 | && subdomain->status != GPD_STATE_ACTIVE) { |
| 1228 | mutex_unlock(&subdomain->lock); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1229 | genpd_release_lock(genpd); |
| 1230 | goto start; |
| 1231 | } |
| 1232 | |
| 1233 | if (genpd->status == GPD_STATE_POWER_OFF |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1234 | && subdomain->status != GPD_STATE_POWER_OFF) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1235 | ret = -EINVAL; |
| 1236 | goto out; |
| 1237 | } |
| 1238 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1239 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1240 | if (link->slave == subdomain && link->master == genpd) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1241 | ret = -EINVAL; |
| 1242 | goto out; |
| 1243 | } |
| 1244 | } |
| 1245 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1246 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
| 1247 | if (!link) { |
| 1248 | ret = -ENOMEM; |
| 1249 | goto out; |
| 1250 | } |
| 1251 | link->master = genpd; |
| 1252 | list_add_tail(&link->master_node, &genpd->master_links); |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1253 | link->slave = subdomain; |
| 1254 | list_add_tail(&link->slave_node, &subdomain->slave_links); |
| 1255 | if (subdomain->status != GPD_STATE_POWER_OFF) |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 1256 | genpd_sd_counter_inc(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1257 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1258 | out: |
Rafael J. Wysocki | bc0403f | 2011-08-08 23:43:59 +0200 | [diff] [blame] | 1259 | mutex_unlock(&subdomain->lock); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1260 | genpd_release_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1261 | |
| 1262 | return ret; |
| 1263 | } |
| 1264 | |
| 1265 | /** |
| 1266 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
| 1267 | * @genpd: Master PM domain to remove the subdomain from. |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1268 | * @subdomain: Subdomain to be removed. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1269 | */ |
| 1270 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1271 | struct generic_pm_domain *subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1272 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1273 | struct gpd_link *link; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1274 | int ret = -EINVAL; |
| 1275 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1276 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1277 | return -EINVAL; |
| 1278 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1279 | start: |
| 1280 | genpd_acquire_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1281 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1282 | list_for_each_entry(link, &genpd->master_links, master_node) { |
| 1283 | if (link->slave != subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1284 | continue; |
| 1285 | |
| 1286 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
| 1287 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1288 | if (subdomain->status != GPD_STATE_POWER_OFF |
| 1289 | && subdomain->status != GPD_STATE_ACTIVE) { |
| 1290 | mutex_unlock(&subdomain->lock); |
| 1291 | genpd_release_lock(genpd); |
| 1292 | goto start; |
| 1293 | } |
| 1294 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1295 | list_del(&link->master_node); |
| 1296 | list_del(&link->slave_node); |
| 1297 | kfree(link); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1298 | if (subdomain->status != GPD_STATE_POWER_OFF) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1299 | genpd_sd_counter_dec(genpd); |
| 1300 | |
| 1301 | mutex_unlock(&subdomain->lock); |
| 1302 | |
| 1303 | ret = 0; |
| 1304 | break; |
| 1305 | } |
| 1306 | |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1307 | genpd_release_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1308 | |
| 1309 | return ret; |
| 1310 | } |
| 1311 | |
| 1312 | /** |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1313 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. |
| 1314 | * @dev: Device to add the callbacks to. |
| 1315 | * @ops: Set of callbacks to add. |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1316 | * @td: Timing data to add to the device along with the callbacks (optional). |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1317 | */ |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1318 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
| 1319 | struct gpd_timing_data *td) |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1320 | { |
| 1321 | struct pm_domain_data *pdd; |
| 1322 | int ret = 0; |
| 1323 | |
| 1324 | if (!(dev && dev->power.subsys_data && ops)) |
| 1325 | return -EINVAL; |
| 1326 | |
| 1327 | pm_runtime_disable(dev); |
| 1328 | device_pm_lock(); |
| 1329 | |
| 1330 | pdd = dev->power.subsys_data->domain_data; |
| 1331 | if (pdd) { |
| 1332 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
| 1333 | |
| 1334 | gpd_data->ops = *ops; |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1335 | if (td) |
| 1336 | gpd_data->td = *td; |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1337 | } else { |
| 1338 | ret = -EINVAL; |
| 1339 | } |
| 1340 | |
| 1341 | device_pm_unlock(); |
| 1342 | pm_runtime_enable(dev); |
| 1343 | |
| 1344 | return ret; |
| 1345 | } |
| 1346 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); |
| 1347 | |
| 1348 | /** |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1349 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1350 | * @dev: Device to remove the callbacks from. |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1351 | * @clear_td: If set, clear the device's timing data too. |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1352 | */ |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1353 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1354 | { |
| 1355 | struct pm_domain_data *pdd; |
| 1356 | int ret = 0; |
| 1357 | |
| 1358 | if (!(dev && dev->power.subsys_data)) |
| 1359 | return -EINVAL; |
| 1360 | |
| 1361 | pm_runtime_disable(dev); |
| 1362 | device_pm_lock(); |
| 1363 | |
| 1364 | pdd = dev->power.subsys_data->domain_data; |
| 1365 | if (pdd) { |
| 1366 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
| 1367 | |
| 1368 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1369 | if (clear_td) |
| 1370 | gpd_data->td = (struct gpd_timing_data){ 0 }; |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1371 | } else { |
| 1372 | ret = -EINVAL; |
| 1373 | } |
| 1374 | |
| 1375 | device_pm_unlock(); |
| 1376 | pm_runtime_enable(dev); |
| 1377 | |
| 1378 | return ret; |
| 1379 | } |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 1380 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1381 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1382 | /* Default device callbacks for generic PM domains. */ |
| 1383 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 1384 | /** |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 1385 | * pm_genpd_default_save_state - Default "save device state" for PM domians. |
| 1386 | * @dev: Device to handle. |
| 1387 | */ |
| 1388 | static int pm_genpd_default_save_state(struct device *dev) |
| 1389 | { |
| 1390 | int (*cb)(struct device *__dev); |
| 1391 | struct device_driver *drv = dev->driver; |
| 1392 | |
| 1393 | cb = dev_gpd_data(dev)->ops.save_state; |
| 1394 | if (cb) |
| 1395 | return cb(dev); |
| 1396 | |
| 1397 | if (drv && drv->pm && drv->pm->runtime_suspend) |
| 1398 | return drv->pm->runtime_suspend(dev); |
| 1399 | |
| 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | /** |
| 1404 | * pm_genpd_default_restore_state - Default PM domians "restore device state". |
| 1405 | * @dev: Device to handle. |
| 1406 | */ |
| 1407 | static int pm_genpd_default_restore_state(struct device *dev) |
| 1408 | { |
| 1409 | int (*cb)(struct device *__dev); |
| 1410 | struct device_driver *drv = dev->driver; |
| 1411 | |
| 1412 | cb = dev_gpd_data(dev)->ops.restore_state; |
| 1413 | if (cb) |
| 1414 | return cb(dev); |
| 1415 | |
| 1416 | if (drv && drv->pm && drv->pm->runtime_resume) |
| 1417 | return drv->pm->runtime_resume(dev); |
| 1418 | |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | /** |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1423 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. |
| 1424 | * @dev: Device to handle. |
| 1425 | */ |
| 1426 | static int pm_genpd_default_suspend(struct device *dev) |
| 1427 | { |
| 1428 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; |
| 1429 | |
| 1430 | return cb ? cb(dev) : pm_generic_suspend(dev); |
| 1431 | } |
| 1432 | |
| 1433 | /** |
| 1434 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. |
| 1435 | * @dev: Device to handle. |
| 1436 | */ |
| 1437 | static int pm_genpd_default_suspend_late(struct device *dev) |
| 1438 | { |
| 1439 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; |
| 1440 | |
| 1441 | return cb ? cb(dev) : pm_generic_suspend_noirq(dev); |
| 1442 | } |
| 1443 | |
| 1444 | /** |
| 1445 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. |
| 1446 | * @dev: Device to handle. |
| 1447 | */ |
| 1448 | static int pm_genpd_default_resume_early(struct device *dev) |
| 1449 | { |
| 1450 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; |
| 1451 | |
| 1452 | return cb ? cb(dev) : pm_generic_resume_noirq(dev); |
| 1453 | } |
| 1454 | |
| 1455 | /** |
| 1456 | * pm_genpd_default_resume - Default "device resume" for PM domians. |
| 1457 | * @dev: Device to handle. |
| 1458 | */ |
| 1459 | static int pm_genpd_default_resume(struct device *dev) |
| 1460 | { |
| 1461 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; |
| 1462 | |
| 1463 | return cb ? cb(dev) : pm_generic_resume(dev); |
| 1464 | } |
| 1465 | |
| 1466 | /** |
| 1467 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. |
| 1468 | * @dev: Device to handle. |
| 1469 | */ |
| 1470 | static int pm_genpd_default_freeze(struct device *dev) |
| 1471 | { |
| 1472 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; |
| 1473 | |
| 1474 | return cb ? cb(dev) : pm_generic_freeze(dev); |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. |
| 1479 | * @dev: Device to handle. |
| 1480 | */ |
| 1481 | static int pm_genpd_default_freeze_late(struct device *dev) |
| 1482 | { |
| 1483 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; |
| 1484 | |
| 1485 | return cb ? cb(dev) : pm_generic_freeze_noirq(dev); |
| 1486 | } |
| 1487 | |
| 1488 | /** |
| 1489 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. |
| 1490 | * @dev: Device to handle. |
| 1491 | */ |
| 1492 | static int pm_genpd_default_thaw_early(struct device *dev) |
| 1493 | { |
| 1494 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; |
| 1495 | |
| 1496 | return cb ? cb(dev) : pm_generic_thaw_noirq(dev); |
| 1497 | } |
| 1498 | |
| 1499 | /** |
| 1500 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. |
| 1501 | * @dev: Device to handle. |
| 1502 | */ |
| 1503 | static int pm_genpd_default_thaw(struct device *dev) |
| 1504 | { |
| 1505 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; |
| 1506 | |
| 1507 | return cb ? cb(dev) : pm_generic_thaw(dev); |
| 1508 | } |
| 1509 | |
| 1510 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1511 | * pm_genpd_init - Initialize a generic I/O PM domain object. |
| 1512 | * @genpd: PM domain object to initialize. |
| 1513 | * @gov: PM domain governor to associate with the domain (may be NULL). |
| 1514 | * @is_off: Initial value of the domain's power_is_off field. |
| 1515 | */ |
| 1516 | void pm_genpd_init(struct generic_pm_domain *genpd, |
| 1517 | struct dev_power_governor *gov, bool is_off) |
| 1518 | { |
| 1519 | if (IS_ERR_OR_NULL(genpd)) |
| 1520 | return; |
| 1521 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1522 | INIT_LIST_HEAD(&genpd->master_links); |
| 1523 | INIT_LIST_HEAD(&genpd->slave_links); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1524 | INIT_LIST_HEAD(&genpd->dev_list); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1525 | mutex_init(&genpd->lock); |
| 1526 | genpd->gov = gov; |
| 1527 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); |
| 1528 | genpd->in_progress = 0; |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 1529 | atomic_set(&genpd->sd_count, 0); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1530 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
| 1531 | init_waitqueue_head(&genpd->status_wait_queue); |
Rafael J. Wysocki | c6d22b3 | 2011-07-12 00:39:36 +0200 | [diff] [blame] | 1532 | genpd->poweroff_task = NULL; |
| 1533 | genpd->resume_count = 0; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1534 | genpd->device_count = 0; |
| 1535 | genpd->suspended_count = 0; |
Rafael J. Wysocki | 221e9b5 | 2011-12-01 00:02:10 +0100 | [diff] [blame] | 1536 | genpd->max_off_time_ns = -1; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1537 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
| 1538 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; |
| 1539 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1540 | genpd->domain.ops.prepare = pm_genpd_prepare; |
| 1541 | genpd->domain.ops.suspend = pm_genpd_suspend; |
| 1542 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
| 1543 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; |
| 1544 | genpd->domain.ops.resume = pm_genpd_resume; |
| 1545 | genpd->domain.ops.freeze = pm_genpd_freeze; |
| 1546 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
| 1547 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; |
| 1548 | genpd->domain.ops.thaw = pm_genpd_thaw; |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1549 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
| 1550 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1551 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1552 | genpd->domain.ops.restore = pm_genpd_resume; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1553 | genpd->domain.ops.complete = pm_genpd_complete; |
Rafael J. Wysocki | ecf0047 | 2011-11-27 13:11:44 +0100 | [diff] [blame] | 1554 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
| 1555 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 1556 | genpd->dev_ops.freeze = pm_genpd_default_suspend; |
| 1557 | genpd->dev_ops.freeze_late = pm_genpd_default_suspend_late; |
| 1558 | genpd->dev_ops.thaw_early = pm_genpd_default_resume_early; |
| 1559 | genpd->dev_ops.thaw = pm_genpd_default_resume; |
| 1560 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
| 1561 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; |
| 1562 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; |
| 1563 | genpd->dev_ops.thaw = pm_genpd_default_thaw; |
Rafael J. Wysocki | 5125bbf | 2011-07-13 12:31:52 +0200 | [diff] [blame] | 1564 | mutex_lock(&gpd_list_lock); |
| 1565 | list_add(&genpd->gpd_list_node, &gpd_list); |
| 1566 | mutex_unlock(&gpd_list_lock); |
| 1567 | } |